Statisticheski godishnik na Narodna Republika Bŭlgarii︠a︡.

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Item Link Original Source
Limited (search only)   1964 University of Illinois at Urbana-Champaign
Limited (search only)   1966 University of Illinois at Urbana-Champaign
Limited (search only)   1969 University of Illinois at Urbana-Champaign
Limited (search only)   1970:1-2 University of Illinois at Urbana-Champaign
Limited (search only)   1971 University of Illinois at Urbana-Champaign