The storage unit of Ren Xu's Essay with Attaché is

Tsinghua University Library. The Essay of Ren Xu's Attaché is now in the Tsinghua University Library, which records the visit to Dongling by an Englishman and an Attaché in the seventh year of Jiaqing (1802). Tsinghua University Library was approved by the State Council as the first batch of national key ancient books protection units, with the goal of building a research-oriented, digital, open and civilized modern library.