National Archives and Records Administration II, Records of the Department of State relating to internal affairs of Bulgaria 1910-1944, Washington 1982 (Microfilm-Edition): Doc. 874.4016/52, p. 1. Original in English.
1939-03-10 | Biddle Jr., Anthony J. Drexel | Poland
National Archives and Records Administration II, RG 59, Records of the Department of State relating to internal affairs of Poland 1916-1944, Washington, D.C. 1981 (Microfilm), Doc. 860C.4016/589. Original in English.