41
Published: 1978
42
Published: 1978
43
Published: 1988
Superior document: Enciklopedija Bălgarija 6
44
Published: 1982
Superior document: Enciklopedija Bălgarija 3
45
Published: 1978
Superior document: Enciklopedija Bălgarija 1
46
47
Published: 1958
48
“...Bălgarska akademija na naukite...”
49
“...Bălgarska akademija na naukite...”
50
“...Bălgarska akademija na naukite...”
51
Published: 1989
52
“...Bălgarska akademija na naukite...”
53
Published: 1972
54
“...Bălgarska akademija na naukite...”
55
“...Bălgarska akademija na naukite...”
56
“...Bălgarska akademija na naukite...”
57
“...Bălgarska akademija na naukite...”
58
“...Bălgarska akademija na naukite...”
59
“...Bălgarska akademija na naukite...”