21
22
Published: 1987
Superior document: Heterogeneous catalysis proceedings of the sixth international symposium, [Sofia, July 13 - 18, 1987] 1
23
Published: 1970-
24
Published: 1931
25
Published: 1963-
Links: Inhaltsverzeichnis
26
Published: 1966
27
Published: 1970
Superior document: Prinos kăm istorijata na tărgovijata na Turcija i Bălgarija 6
28
Published: 1979
Superior document: Izvestija na Archeologičeskija Institut / Bălgarska Akademija na Naukite 35
29
Published: 1974
30
31
Published: 1969
Superior document: Sto godini Bălgarska Akademija na Naukite 1869 - 1969 1
32
Published: 2009
Links: Inhaltsverzeichnis
33
Published: 2016-
34
Published: 1911-1940
35
Published: 1913-1949
36
Published: 1959-;, 1959-[?]
37
Published: 1978
38
Published: 1978
39
Published: 1988
Superior document: Enciklopedija Bălgarija 6
40
Published: 1982
Superior document: Enciklopedija Bălgarija 3