A Marxism-Leninism, Mao Zedong Thought?
B philosophy?
Introduction to social science
Politics, law
E military?
F economy?
G culture, education, science, sports?
H language, writing?
I literature?
J art?
K history, geography?
Introduction to natural science?
O mathematical science and chemistry?
P astronomy, earth science?
Q biological science?
R medicine, health?
Agricultural science?
technology
TD mining engineering
TE oil and gas industry?
TF metallurgical industry?
TG metallurgy, metal technology?
Mechanical instrument industry?
TJ weapons industry?
TK power engineering?
TL atomic energy technology
Radio electronics, electronic technology
TP automation technology, computing technology?
TQ chemical?
TS light industry, handicraft industry?
Slaughter architecture science?
Television water conservancy project?
U traffic?
5. Aviation and aerospace?
X environmental science?
Z comprehensive publication
ISBN code is divided into four segments with "-"in the middle. Such as "7-108-01662-1". The first paragraph is the country code. "7" means "China", and the second paragraph is the publishing house code. "108" means "Sanlian Bookstore", and the third paragraph is the book code. "0 1662" refers to the 1662 book published by Sanlian Bookstore. The fourth paragraph is the check code, which is calculated by the first nine digits according to certain rules. The ISBN code thus formed can uniquely represent each book. 7- 108-0 1662- 1.