- National Archives (USA), Records of the Department of State Relating to Internal Affairs of Bulgaria
- Ethnika Archeia (IPA)-Archeia tou Ypoyrgeiou ton Exoterikon shetika me tis Esoterikes Ypotheseis sti Voulgaria
The documents in this file are primarily instructions to and dispatches from U.S. diplomatic and consular staff regarding political, economic, military, social, and other internal conditions and events in Bulgaria. Other types of material represented are reports and memoranda prepared by State Department staff, communications between the State Department and foreign governments, and correspondence with other departments of the U.S. government, private firms and individuals. Some materials are related to the Bulgarian alliance with the Nazis, the position of the Jews, and anti-Semitic laws.