Thanks for the link, David. Actually, the site now also has tons of world history content. See our Features on Chinese history, Indian history, Women's history, Islamic history, and more.
The Harvard-Yenching Library holds some 5,000 photographs and 10,000 negatives taken by Hedda Hammer Morrison (1908-1991) while resident in Beijing from 1933 to 1946. The photographs, mounted in thematic albums prepared by Mrs. Morrison, and the negatives, were bequeathed to the Harvard-Yenching Library, "the best permanent home for her vision of a city and people that she loved [Alastair Morrison]."
Over 1000 photos of Muslims and Christian missionaries working among them in Western China in the 1920s and 1930s form the core of this collection, which is supplemented by several hundred books, pamphlets, broadsides, etc., in several languages.