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- Institut za istorii︠a︡ (Bŭlgarska akademii︠a︡ na naukite)65
- Bulgaria64
- Institut za literatura (Bŭlgarska akademii︠a︡ na naukite)63
- Institut za bŭlgarski ezik (Bŭlgarska akademii︠a︡ na naukite)62
- Bŭlgarska akademii︠a︡ na naukite57
- Arnaudov, Mikhail, 1878-197855
- Dinekov, Petŭr Nikolov, 1910-51
- Bulgaria. T︠S︡entralno statistichesko upravlenie45
- Narodna biblioteka "Kiril i Metodiĭ"41
- Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)37
- Angelov, Dimitŭr Simeonov35
- Karanfilov, Efrem34
- Zarev, Panteleĭ33
- Bogdanov, Ivan28
- Nat︠s︡ionalen statisticheski institut (Bulgaria)28
- Todorov, Nikolaĭ27
- Arkheologicheski institut i muzeĭ (Bŭlgarska akademii︠a︡ na naukite)26
- Lekov, Docho26
- Zhechev, Toncho26
- Vazov, Ivan Minchov, 1850-192125