This series consists of four subseries that include maps of China, Japan, the United States, and other places in the world from 1905-1964; Publications and academic offprints from 1891-1977, booklets from 1906-1970, pamphlets of global tourist sites from 1915-1975, and newspaper clippings and magazine excerpts from 1882-1977; Ch’en’s research notes from 1929-1935 and research materials from 1857-1969; and manuscripts from 1876-1969 written by Ch’en and his friends and students.