Columbia subject headings:
Slavi︠a︡nsko druzhestvo v Bŭlgarii︠a︡--History.
Slavs--Societies, etc.
Harvard subject headings:
Bulgaria--Intellectual life--1878-1944.
Bulgaria--Intellectual life--1944-1990.
Bulgaria--Intellectual life--1990-
Panslavism--History.
Slavi͡ansko druzhestvo v Bŭlgarii͡a--History.
Slavophilism--Bulgaria--History.
Slavs--Societies, etc.
Princeton subject headings: