National Archives and Records Administration II, RG 59 - Records of the Department of State relating to the internal affairs of Bulgaria 1910-1944, Washington D.C. 1982 (Microfilm), Doc. 874.4016/45. Original in English.
Japan Center for Asia Historical Materials (JACAR), Minzoku mondai kankei zakken: Yudayajin mondai [Documents on the Issus of Nationalities: The Jewish Issue] B04013207600-10500, 11:391-392. Original in Japanese.
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.