You can refer to the Chinese Book Classification to classify books
The "Chinese Book Classification" is a classification based on scientific classification and combined with the characteristics of books.
It divides subjects into five major categories and 22 major categories. The basic sequence is: Marxism-Leninism-Maoism thought, philosophy, social sciences, natural sciences, comprehensive books,
A Marxism, Leninism, Mao Zedong Thought
A Marxism, Leninism, Mao Zedong Thought
1 Works of Marx and Engels
11 Selections and Collected Works
12 Single line works
121 The period of formation of Marxism (-1847)
122 The ups and downs of the revolutionary storm (1848-1863)
123 The period of the First International and the Paris Commune (1864-1872)
124 The period of widespread spread of Marxism and the establishment of socialist parties in various countries (1873-June 1889)
125 Second International Period (July 1889-1895)
13 Collection of letters, diaries, correspondence, conversations
14 Poetry
15 Handwriting
16 Collection of special topics
18 Quotations
2 Lenin's works
21 Selections and collections
22 Single works
23 Collection of letters, diaries, correspondence, conversations
25 Handwriting
26 Collection of special topics
28 Quotations
3 Stalin’s writings
31 Anthologies, anthologies
32 Single works
33 Collections of letters, diaries, correspondence, conversations
35 Handwriting
36 Special topics collection
38 Quotes
4 Mao Zedong's writings
41 Selections and anthologies
42 Single works
421 Before the First Civil Revolutionary War (-1924)
422 During the First Civil Revolutionary War (1924-July 1927)
423 The First Civil War Revolutionary War Period (August 1927-June 1937)
424 Anti-Japanese War Period (July 1937-August 1945)
425 The Third Civil Revolutionary War Period (September 1945-September 1949)
426 Period of Socialist Revolution and Socialist Construction
43 Collection of letters, diaries, correspondence, and conversations
44 Poetry
45 Handwriting
46 Collection of special topics
48 Quotations
5 Collection of works of Marx, Engels, Lenin, Stalin and Mao Zedong
56 Thematic Collection
58 Quotations
7 The lives and biographies of Marx, Engels, Lenin, Stalin, and Mao Zedong
71 Marx
p>72 Engels
73 Lenin
74 Stalin
75 Mao Zedong
8 Marxism, Leninism, Mao Zedong Thought Study and research on the works of Marx and Engels
81 Study and research on the works of Marx and Engels
82 Study and research on the works of Lenin
83 Study and research on the works of Stalin
p>84 Study and Research on Mao Zedong’s Works
85 Study and Research on Collection of Works
B Philosophy
B Philosophy
0 Philosophical Theory
0-0 Marxist Philosophy (General Introduction)
>
1 Basic issues in philosophy
2 Dialectical materialism
21 Theory of materiality
22 Theory of consciousness
23 Theory of epistemology and reflection theory
24 Materialist Dialectics
25 Categories of Materialist Dialectics
26 Thinking Methods and Working Methods
27 Application of Dialectical Materialism
p>
3 Historical materialism (historical materialism)
8 Philosophical schools and their research
81 Idealism
82 Positivism, empirical criticism ism (Machism)
83 Voluntarism, philosophy of life
84 Neo-Kantian attention, neo-Hegelianism
85 New realism, logical positivism On (New Positivism, Logical Empiricism)
86 Existentialism (Survivalism)
87 Pragmatism
88 Neo-Thomism (New Scholasticism)
89 Other philosophical schools
1 World philosophy
12 Ancient philosophy
13 Medieval philosophy
14 Modern times Philosophy
15 Modern Philosophy
17 The Spread and Development of Marxist Philosophy
2 Chinese Philosophy
20 Materialism and Idealism ( General)
22 Pre-Qin Philosophy
221 Pre-Confucian Philosophy
222 Confucianism
223 Taoism
224 Mohist
225 Famous
226 Legalist
227 Yin-Yang
228 Political strategist
229 Miscellaneous
232 Qin and Han Philosophy (General Introduction) (221 BC-220 AD)
233 Philosophy of the Qin Dynasty (221-207 BC)
234 Philosophy of the Han Dynasty (206 BC-220 AD)
235 Philosophy of the Three Kingdoms, Jin, and Southern and Northern Dynasties (220-589)
241 Philosophy of the Sui, Tang, and Five Dynasties (581-960) )
244 Philosophy of the Song and Yuan Dynasties (960-1368)
248 Philosophy of the Ming Dynasty (1368-1644)
249 Philosophy of the Qing Dynasty (1644-1840) Years)
25 Modern Philosophy (1840-1918)
26 Modern Philosophy (1919- Years)
27 The Spread and Development of Marxist Philosophy in China
3 Asian Philosophy
302 Ancient Philosophy (Asia)
303 Medieval Philosophy (Asia)
304 Modern Philosophy (Asia)
305 Modern Philosophy (Asia)
307 The Spread and Development of Marxist Philosophy in Asia
31 East Asian Philosophy
33 Southeast Asian Philosophy ( 1)
34 Southeast Asian Philosophy (2)
35 South Asian Philosophy
36 Central Asian Philosophy
37 West Asian Philosophy (1)
38 West Asian Philosophy (2)
4 African Philosophy
402 Ancient Philosophy (Africa)
403 Medieval Philosophy (Africa)
p>404 Modern Philosophy (Africa)
<p> 405 Modern Philosophy (Africa)
407 The Spread and Development of Marxist Philosophy in Africa
41 North African Philosophy
42 East African Philosophy
43 West African Philosophy (I)
44 West African Philosophy (II)
45 West African Philosophy (III)
46 Central African Philosophy
47 South African Philosophy (1)
48 South African Philosophy (2)
5 European Philosophy
502 Ancient Philosophy (Europe)
503 Medieval Philosophy (Europe)
504 Modern Philosophy (Europe)
505 Modern Philosophy (Europe)
507 The spread and development of Marxist philosophy in Europe
51 Eastern and Central European Philosophy (I)
52 Eastern and Central European Philosophy (II)
53 Nordic Philosophy
54 Southern European Philosophy (1)
55 Southern European Philosophy (2)
56 Western European Philosophy
6 Oceanic Philosophy
7 American Philosophy
80 Science of Thinking (General Introduction)
81 Logic (Confucianism)
0 General Introduction
811 Dialectical Logic
812 Formal logic (fame, dialectics)
[813] Mathematical logic (symbolic logic) (appropriate to O141)
[814] Probabilistic logic
815 Philosophical Logic (Non-Classical Logic)
819 Applied Logic
82 Ethics (Moral Philosophy)
0 General Introduction
821 Outlook on life, philosophy of life
822 National ethics
823 Family and marriage ethics
824 Social ethics
825 Personal cultivation
83 Aesthetics
0 General Introduction
832 Aesthetics and Social Production
832 Aesthetics and Real Social Life
[835] Art Aesthetics (should enter J01)
84 Psychology
0 General Introduction
841 Psychological Research Methods
842 Psychological processes and psychological practices
843 Generative psychology
844 Developmental psychology (human psychology)
845 Physiological psychology
846 Abnormal psychology, pathological psychology, superconscious psychology
848 Personality psychology, personality psychology
849 Applied psychology
9 Atheism, religion
91 Atheism
92 Religion
93 Myth and primitive religion
94 Buddhism
95 Taoism
p>
96 Islam (Islam)
97 Christianity
98 Other religions
99 Superstition
C Society Science
C General Introduction to Social Sciences
0 Social Science Theory and Methodology
1 Current Situation and Overview of Social Sciences
2 Institutions and Groups , conference
3 Social science research methods
4 Social science education and popularization
5 Social science series, collections, and continuous publications
51 Series (Hui Keshu)
52 Complete works and anthologies
53 Collected works and conference proceedings
54 Yearbooks and annuals
55 Serials and journals
6 Social sciences Reference books
[7] "Social science literature search book (please check G257.33, Z88/89)"
8 Statistics
81 Statistics Methods
[82] Specialized statistics (suitable for entry into related disciplines)
83 Statistical data from countries around the world
91 Sociology
92 Demography
93 Management
[94] Systems theory (systems, systems engineering) (please check N94)
96 Talent science
D Politics, Law
0 Political Theory
1/3 Communist Movement, Communist Party
1 International* The Communist Movement
2 The Communist Party of China and the Communist Youth League
3 The Communist Parties of various countries
4 Workers , farmers, youth, women’s movements and organizations
5 World Politics
6 Chinese Politics
7 Politics of various countries
73 Asian Politics
74 African Politics
75 European Politics
76 Oceania Politics
77 American Politics
8 Diplomacy, International Relations
9 Law
E Military
0 Military Theory
1 World Military
2 Chinese Military
3/7 Military of various countries
3 Asian military
4 African military
5 European military
6 Oceania Military
7 American Military
8 Strategy, Tactics, and Battles
9 Military Technology
99 Military Topography, Military Geography Study
F Economics
0 Political Economics
1 Economic overview, economic history, economic geography of various countries in the world
2 Economic planning and Management
3 Agricultural Economy
4 Industrial Economy
5 Transportation Economy
6 Somewhat Economic
7 Trade Economics
8 Finance, Finance
G Culture, Science, Education, Sports
0 Cultural Theory
1 Cultural undertakings in various countries around the world Overview
11 World Military
12 Chinese Military
13 Asian Military
14 African Military
15 Europe Military
16 Oceania Military
17 American Military
2 Information and Knowledge Dissemination
3 Science, Scientific Research
4 Education
4 Education
5 Education in various countries in the world
6 Education at all levels
7 Various types of education
p>8 Physical Education
H Language and Writing
0 Linguistics
1 Chinese
2 Chinese Minority Languages
3 Commonly used foreign languages ??
31 English
32 French
33 German
34 Spanish
35 Russian
36 Japanese
37
Arabic
4/84 Languages ??of various language families
4 Sino-Tibetan language family
5 Altaic language family (Turkic-Mongol-Tungustic language family)
61 Austroasiatic
62 South Indian (Dravidian, Dravida)
63 Austronesian (Malayan-Polynesian) )
64 Northeast Asian Languages
65 Ibero-Caucasian Languages
66 Finno-Ugric Languages
67 Semitic -Inclusive language family
7 Indo-European language family
81 African language family
83 American language family
84 Oceania language family
p>9 International Auxiliary Language
I Literature
0 Literary Theory
1 World Literature
2 Chinese Literature
p>3/7 Literature from various countries
3 Asian literature
4 African literature
5 European literature
6 Oceania Literature
7 American Literature
J Art
0 Art Theory
1 Overview of Art in Countries in the World
2 Painting
29 Calligraphy, seal cutting
3 Sculpture
4 Photography art
5 Arts and crafts
[59 ] Architectural Arts (please check TU-8)
6 Music
7 Dance
8 Theater Arts
9 Film and Television Arts
K History, Geography
0 Historical Theory
1 World History
2 Chinese History
3/ 7 History of various countries
3 History of Asia
4 History of Africa
5 History of Europe
6 History of Oceania
7 History of the Americas
81/83 Biography
81 Research and preparation of biographies and biographies of world figures
82 Biographies of Chinese figures
83 Biographies of figures from various countries
85/88 Cultural relics and archeology
85 Archeology
86 World cultural relics and archeology
87 Chinese cultural relics and archeology
88 Cultural Relics and Archeology of Various Countries
89 Customs and Habits
9 Geography
N Natural Sciences
N General Introduction to Natural Sciences
0 Natural science theory and methodology
1 Current status and overview of natural science
2 Natural science institutions, groups, conferences
3 Natural science Research methods
4 Natural science education and popularization
5 Natural science series, collections, and serial publications
6 Natural science reference books
[7] "Natural science literature search tool (please check G257.36, Z88/89)"
8 Natural science investigation and inspection
91 Natural research, nature History
94 Systems theory (systems, systems engineering)
[99] Information science, information work (please check G35)
O Mathematical science and chemistry
1 Mathematics
11 Classical Mathematics
12 Elementary Mathematics
13 Advanced Mathematics
14 Mathematical Logic, Basic Mathematics
15 Algebra, number theory, combinatorial theory
17 Mathematical analysis
18 Geometry, topology
19 Overall analysis, analysis on manifold
21 Probability theory, mathematical statistics
22 Operations research
23 Cybernetics, information theory (mathematical theory)
24 Computational mathematics
29 Applied Mathematics
3 Mechanics
31 Theoretical Mechanics (General Mechanics)
32 Vibration Theory
33 Continuum Mechanics (Deformable Body Mechanics )
34 Solid Mechanics
35 Fluid Mechanics
369 Physical Mechanics
37 Rheology
38 Explosion Mechanics
39 Applied Mechanics
4 Physics
41 Theoretical Physics
42 Acoustics
43 Optics
44 Electromagnetics, electrodynamics
45 Radio physics
46 Vacuum electronics (electron physics)
47 Semiconductors Physics
48 Solid State Physics
51 Low Temperature Physics
52 High Pressure and High Temperature Physics
53 Plasma Physics
55 Thermal and kinetic theory of material molecules
56 Molecular physics, high energy physics
59 Applied physics
6 Chemistry
61 Inorganic Chemistry
62 Organic Chemistry
63 Polymer Chemistry (Polymer)
64 Physical Chemistry (Theoretical Chemistry), Chemistry Physics
65 Analytical Chemistry
69 Applied Chemistry
7 Crystallography
P Astronomy, Earth Science
1 Astronomy
2 Surveying
3 Geophysics
4 Meteorology
5 Geology
6 Geology (2)
7 Oceanography
9 Physical Geography
Q Biological Sciences
1 General Biology
2 Cytology
3 Genetics
4 Biology
5 Biochemistry
6 Biophysics
7 Molecular Biology
81 Bioengineering
[89] Environmental Biology (please check X17)
91 Paleontology
93 Microbiology
94 Botany
95 Zoology
96 Entomology
8 Anthropology
R Medicine and Health
1 Preventive Medicine and Hygiene
2 Chinese Medicine
3 Basic Medicine
4 Clinical Medicine
5 Internal Medicine
6 Surgery
71 Obstetrics and Gynecology
72 Pediatrics
73 Oncology
74 Neurology and Psychiatry
75 Dermatology and Venereology
76
Otolaryngology
77 Ophthalmology
78 Oral Science
79 Foreign Ethnic Medicine
8 Special Medicine
9 Pharmacy
S Agricultural Science
1 Basic Agricultural Science
2 Agricultural Engineering
3 Agricultural Science (Agronomy)
4 Plant protection
5 Crops
6 Horticulture
7 Forestry
8 Animal husbandry, veterinary medicine, hunting, silkworms, Bee
9 Aquaculture, Fisheries
T Industrial Science
TB General Industrial Technology
1 Basic Engineering Science
2 Engineering design and surveying
3 Engineering materials science
[31] Metallic materials (please check TG4)
32 Non-metallic materials
33 Composite materials
35 Low-temperature resistant materials, high-temperature resistant materials
37 Corrosion-resistant materials
39 Other special performance materials
4 General industrial technology and equipment
41 Explosive technology
42 Sealing technology
43 Thin film technology
44 Powder technology
48 Packaging Engineering
49 Factory, Workshop
5 Acoustic Engineering
6 Refrigeration Engineering
7 Vacuum Technology
8 Photography Technology
9 Metrology
TD Mining Engineering
1 Mine Geology and Surveying
2 Mine Design and Construction
3 Mine Pressure and Support
4 Mining Machinery
5 Mining Transportation and Equipment
6 Mining Electrician
7 Mine safety and labor protection
8 Mine mining
9 Ore dressing
TE Petroleum and natural gas industry
1 Petroleum, Natural Gas Geology and Exploration
2 Drilling Engineering
3 Oil and Gas Field Development and Exploitation
5 Offshore Oil and Gas Field Development and Exploitation
6 Petroleum and Natural Gas Processing industry
8 Petroleum and natural gas storage and transportation
9 Petroleum machinery and automation
[99] Environmental protection and comprehensive utilization of petroleum and natural gas industry (appropriate Enter p>
4 Iron and steel smelting (ferrous metal smelting) (overview)
5 Iron smelting
6 Iron alloy smelting
7 Steel making
79 Other ferrous metal smelting
8 Non-ferrous metal smelting
TG Metallurgy, Metal Technology
1 Metallurgy, Heat Treatment
2 Casting
3 Metal pressure processing
4 Welding, metal cutting and bonding
5 Metal cutting and machine tools
7 Tools, abrasives, grinding tools, fixtures, molds, hand tools
8 Tolerances and technical measurements and mechanical measuring instruments
9 Fitter technology and assembly technology
TH Mechanical and Instrument Technology
11 Mechanics (Basic Theory of Mechanical Design)
12
Mechanical design, calculation and drawing
13 Mechanical parts and transmission devices
14 Mechanical manufacturing materials
16 Mechanical manufacturing process
17 Operation and maintenance
18 Machinery factory (workshop)
2 Lifting and transportation machinery
3 Pumps
4 Gas compression and conveying machinery
6 Special Machinery
7 Instruments and Instruments
TJ Weapons Industry
0 General Questions
2 Firearms
3 Artillery
4 Ammunition, fuses, pyrotechnics
5 Explosive equipment, pyrotechnics, explosives
6 Water Weapons
7 Rockets, missiles
8 Tanks, battleships, fighter planes, aerospace weapons
9 Nuclear weapons and other special weapons and protective equipment
TK Power Industry
0 General Questions
1 Thermal Engineering, Thermal Engine
2 Steam Power Engineering
3 Thermal Engineering Measurement and thermal automatic control
4 Internal combustion engine engineering
5 Special thermal energy and its utilization
6 Bioenergy and its utilization
7 Water Energy, hydraulic machinery
8 Wind energy, wind machinery
91 Hydrogen energy and its utilization
TL Atomic energy technology
1 Basic theory
2 Nuclear fuel and its production
3 Nuclear reactor engineering
4 Various nuclear reactors and nuclear power plants
5 Accelerator
6 Controlled thermonuclear reaction (fusion reaction theory and experimental device)
7 Radiation protection
8 Particle detection technology, radiation detection technology and nuclear instrumentation
91 Nuclear explosion
92 Production and preparation of radioactive isotopes
929 Radiation source
93 Packaging, transportation and storage of radioactive materials
94 Management and Comprehensive Utilization of Radioactive Waste
99 Application of Atomic Energy Technology
TM Electrical Technology
0 General Questions
1 Electrician Basic Theory
2 Electrical Materials
3 Electric Machines
4 Transformers, Converters and Reactors
5 Electrical Appliances
6 Power generation, power plants
7 Power transmission and distribution projects, power grids and power systems
8 High voltage technology
91 Independent power supply technology (direct power generation )
92 Electrification, electric energy application
93 Electrical measurement technology and instruments
TN Radio electronics, telecommunications technology
0 General Questions
1 Vacuum electronic technology
2 Optoelectronics technology, laser technology
3 Semiconductor technology
4 Microelectronics, integrated circuits ( IC)
6 Electronic components and assemblies
7 Basic electronic circuits
8 Radio and telecommunications equipment
91 Communications
92 Wireless communications
93 Broadcasting
94 Television
95 Radar
96 Radio navigation
97 Electronic countermeasures (jamming and anti-jamming)
[98] Radio,
Telecommunications measurement technology and instruments (please check TM93)
99 Application of radio electronics
TP Automation technology, computing technology
1 Basic theory of automation
11 Automation system theory
13 Automation control theory
14 Automatic information theory
15 Automatic simulation theory (automatic simulation theory)
17 Switch circuit theory
18 Artificial intelligence theory
2 Automation technology and equipment
20 General issues
21 Automation Components and parts
23 Automation devices and equipment
24 Robotics
27 Automation system theory
29 Automation technology in various aspects Application
3 Computing technology, computers
30 General questions
31 Computer software
32 General calculators and computers
33 Electronic digital computer (discontinuous action electronic computer)
34 Electronic analog computer (continuous action electronic computer)
35 Hybrid electronic computer
36 Microcomputer
38 Other computers
39 Computer applications
6 Fluid technology (fluid control technology)
60 General issues
61 Jet components
62 Jet accessories
63 Detection and signaling device
64 Actuator
65 Power source
66 Jet control circuit
67 Jet automatic control system
69 Application of jet technology
7 Remote sensing technology
70 General issues
72 Remote sensing methods
73 Detection instruments and systems
75 Interpretation, recognition and processing of remote sensing images
p>79 Application of remote sensing technology
8 Telecontrol technology
80 General issues
[81] Components and components (should be entered into TP21)
83 Telecontrol device
84 Channel
87 Telecontrol system
89 Application of telecontrol technology in various aspects
TQ Chemical Industry
0 General Questions
1 Basic Theory
2 Chemical Processes (Physical Processes and Physical and Chemical Processes)
3 Chemical reaction process
4 Chemical raw materials and auxiliary materials
5 Chemical machinery and equipment
6 Chemical production process, final processing and Packaging
7 Chemical Products and By-Products
8 Chemical Plant
[09] Treatment and Comprehensive Utilization of Chemical Industry Wastes (Should Enter X78)
11 Basic inorganic chemical industry
110 General issues
111 Production of inorganic acids
113 Ammonia and ammonium salt industry
114 Chlor-alkali industry
115 Inorganic salt industry
116 Industrial gases
117 Special gases
118 Inorganic peracid and peracid
Salt
12 Chemical industry of non-metallic elements and their inorganic compounds
13 Chemical industry of inorganic compounds of metallic elements
15 Electrochemical industry
16 Electric heating industry, high temperature products industry
17 Silicate industry
2 Basic organic chemical industry
31 Polymer compound industry (polymer industry)
32 Synthetic resin and plastic industry
33 Rubber industry
34 Chemical fiber industry
35 Cellulose chemical processing industry
p>
41 Production of solvents and plasticizers
42 Production of reagents and pure chemicals
43 Adhesive industry
44 Chemical fertilizer industry
45 Pesticide industry
46 Pharmaceutical chemical industry
51 Fuel chemical industry
52 Coking chemical industry
53 Coal chemistry and coal processing and utilization
54 Coal gasification industry
55 Fuel lighting industry
56 Explosives industry, match industry
57 Photosensitive materials industry
58 Magnetic recording materials industry
61 Dyes and intermediates industry
62 Pigments industry
63 Paint industry
64 Chemical processing industry of oils and waxes, soap industry
65 Perfume and cosmetics industry
9 Other chemical industries
TS Light industry, Handicraft industry
0 General questions
1 Textile industry, dyeing and finishing industry
2 Food industry
3 Salt industry
4 Tobacco industry
5 Leather industry
6 Wood processing industry, furniture manufacturing industry
7 Paper industry
8 Printing industry
91 Hardware industry
93 Arts and crafts manufacturing industry
94 Clothing industry, shoemaking industry
95 Other light industries, Handicrafts
97 Living Supply Technology
TU Building Science
1 Basic Building Science
19 Building Survey
2 Architectural design
3 Building structure
4 Soil mechanics, foundation engineering
5 Building materials
6 Building construction machinery and equipment
7 Building Construction
8 House Construction Equipment
9 Underground Construction
7 High-Rise Buildings
98 Areas Planning, town planning
99 Municipal Engineering
TV Water Conservancy Engineering
1 Basic Courses in Water Conservancy Engineering
21 Water Data Survey and Water Conservancy Planning
22 Hydraulic survey and design
3 Hydraulic structure
4 Hydraulic materials
5 Hydraulic engineering construction
6 Water conservancy projects and hydraulic structures
7 Water capacity utilization and hydropower station projects
8 River control projects and flood control projects
[91] Transportation Canals (canals, channels) projects (should be entered into U61)
[02] Harbor projects (should be entered into U65)
[93] Farmland water conservancy projects (should be entered into S27)
U Transportation<
/p>
1 Comprehensive transportation
2 Railway transportation
4 Road transportation
41 Road engineering
44 Bridge and culvert engineering
45 Tunnel Engineering
46 Automobile Engineering
461 Automobile Theory
462 Vehicle Design and Calculation
463 Automobile structural components
464 Automobile engine
465 Automobile materials
466 Automobile manufacturing process
467 Automobile experiment
468 Automobile factory
469 Automobiles for various purposes
471 Automobile driving and use
472 Automobile maintenance and repair
473 Automobiles Using fuel and lubricants
48 Other road transportation tools
49 Traffic engineering and road transportation technical management
6 Water transportation
[ 8] Air transportation
V Aviation and aerospace
1 Research and exploration of aviation and aerospace technology
11 Development of aviation and aerospace and space exploration
19 Aviation and aerospace applications
2 Aviation
21 Basic theory and experiment
22 Aircraft structure and design
23 Aviation engines (propulsion systems)
24 Aviation instruments, equipment, control and navigation
25 Aviation materials
26 Aviation manufacturing processes
27 Various types of spacecraft
31 Aviation fuel and lubricants
32 Aviation flight technology
35 Airport (station), airport and technical management
37 Aerospace Systems Engineering
4 Aerospace (Space Navigation)
41 Basic Theory and Experiment
42 Rocket and Spacecraft Structure (Overall )
43 Propulsion system (engine, thruster)
44 Instruments, equipment, guidance and control
[45] Aerospace materials (please check V25)
46 Manufacturing process
47 Spacecraft and its carriers
51 Aerospace fuels (propellants) and lubricants
52 Aerospace
55 Ground equipment, test sites, launch sites, aerospace bases
57 Aerospace system engineering
[7] Aviation and aerospace medicine (should be included in R85 )
X Environmental Science
1 Basic Theory of Environmental Science
2 Comprehensive Environmental Research
3 Environmental Protection Management
4 Disasters and their prevention and control
5 Environmental pollution and their prevention and control
7 Waste treatment and comprehensive utilization
8 Environmental quality assessment and environmental monitoring
9 Labor Protection Science (Safety Science)
Z Comprehensive Books
Z Comprehensive Books
1 Series
2 Encyclopedias and general books
3 Dictionaries
4 Collections of essays, complete works, anthologies, and miscellaneous works
5 Yearbooks and annuals
6 Periodicals, serial publications
8 Book catalogue, abstracts, indexes