Statisticheski spravochnik na NR Bŭlgaria.

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Item Link Original Source
Limited (search only)   1958 Indiana University
Limited (search only)   1960 Indiana University
Limited (search only)   1965 Pennsylvania State University
Limited (search only)   1966 University of Illinois at Urbana-Champaign
Limited (search only)   1966 Indiana University
Limited (search only)   1966 Pennsylvania State University
Limited (search only)   1967 Indiana University
Limited (search only)   1968 Indiana University