Documents, notes, newspaper clippings, and reports related to the socio-political, military affairs, territorial changes, and economic situations in the Northeastern Region dating from 1943 to 1948. Series also include documents and reports on foreign relations such as a printed copy of the Sino-Soviet Treaty of Friendship and Alliance signed in 1945, the Statement of Appreciation issued in 1946, and one volume of "A Report of the Military Mission of the Republic of China on Negotiations with Soviet Military Authorities for the Withdrawal of Soviet Troops from the Northeastern Provinces" describing the daily proceedings of meetings and negotiations between the two countries from October 1945 to June 1946.