This collection reproduces important letters, reports, memorandums, cablegrams, maps, charts, and other kinds of records relating to the activities of the American Expeditionary Forces in Siberia (hereafter, AEF in Siberia), 1918-20. The bulk of the historical files of the AEF in Siberia consist of war diaries compiled at American Headquarters in Vladivostok. In addition, a few of the war diaries of the garrisons stationed at Shkotovo and the Suchan Mines during the summer of 1919 were included by the Historical Branch in this collection. The Historical Files of the AEF in Siberia also include a number of semiannual, annual, and final reports of operations of the various offices and units comprising the expedition to Siberia. Among the most important of these are the two reports of General Graves, which together give an overall view of the Siberian expedition, and the report of Capt. Laurance B. Packard, an Intelligence officer, entitled "An Account of the American Expeditionary Forces in Siberia, August 1918 to March 1919." Enclosed with Graves' two reports were about 30 reports of offices and units under his command. Other important records comprising the Historical Files of the AEF in Siberia are the four subject files of the Chief of Staff of the Siberian Expedition entitled "Japanese-American Relations" (21-4.7), "Civil Affairs" (21-21.3), "Field Messages" (21-32.16), and "Allies Orders [from Japanese Headquarters]" (21-32.7). These subject files consist of reports, memorandums, letters, cablegrams, telegrams, and maps.