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- Bulgaria155
- United States. Department of State104
- United States79
- United States. Congress. House70
- Institut za istorii︠a︡ (Bŭlgarska akademii︠a︡ na naukite)66
- Bulgaria. T︠S︡entralno statistichesko upravlenie45
- Bulgaria. Glavna direkt︠s︡ii︠a︡ na statistikata37
- Zhivkov, Todor36
- ebrary, Inc35
- Bŭlgarska akademii︠a︡ na naukite32
- Nat︠s︡ionalen statisticheski institut (Bulgaria)30
- Arkheologicheski institut i muzeĭ (Bŭlgarska akademii︠a︡ na naukite)29
- Kosev, Dimitŭr Konstantinov, 1903-28
- Bulgaria, enacting jurisdiction26
- Gi︠u︡zelev, Vasil26
- Angelov, Dimitŭr Simeonov25
- Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)23
- Dimitrov, Georgi, 1882-194922
- Dimitrov, Ilcho Ivanov22
- Khristov, Khristo Angelov21