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- Institut za istorii︠a︡ (Bŭlgarska akademii︠a︡ na naukite)68
- Institut za literatura (Bŭlgarska akademii︠a︡ na naukite)68
- Arnaudov, Mikhail, 1878-197865
- Bulgaria64
- Institut za bŭlgarski ezik (Bŭlgarska akademii︠a︡ na naukite)63
- Bŭlgarska akademii︠a︡ na naukite59
- Dinekov, Petŭr Nikolov, 1910-54
- Bulgaria. T︠S︡entralno statistichesko upravlenie45
- Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)45
- Narodna biblioteka "Kiril i Metodiĭ"43
- Angelov, Dimitŭr Simeonov38
- Karanfilov, Efrem38
- Zarev, Panteleĭ35
- Bogdanov, Ivan33
- Todorov, Nikolaĭ30
- Arkheologicheski institut i muzeĭ (Bŭlgarska akademii︠a︡ na naukite)28
- Fol, Aleksandŭr28
- Nat︠s︡ionalen statisticheski institut (Bulgaria)28
- Zhechev, Toncho28
- Lekov, Docho27