Correspondence, reports, writings, printed matter, memorabilia and photographs relating chiefly to Haag's stay in Manchuria where he worked as the General Secretary of the Harbin YMCA, aiding Russian refugees fleeing the Revolution. Of particular interest are the eye-witness descriptions of conditions in Manchuria and Siberia during that period as well as of the Russian refugee community in Harbin. A smaller amount of material documents Haag's work in the Philippine Islands (1935-1941), in Japan (1950-1954) and in Bridgeport, Conn. from 1942 to 1950 and again from 1954 to 1961. Information on the work of the YMCA is included both in reports and memoranda (1921-1961) and in letters from colleagues in China, Japan, and the Soviet Union. A series of travel notebooks (1921-1935) contain observations on local conditions in Manchuria, China, Japan, Korea and some of the major cities of Europe.