41
Published: 1982
Superior document: Enciklopedija Bălgarija 3
42
Published: 1978
Superior document: Enciklopedija Bălgarija 1
43
Published: 1981
Superior document: Enciklopedija Bălgarija 2
44
Published: 1986
Superior document: Enciklopedija Bălgarija 5
45
Published: 1984
Superior document: Enciklopedija Bălgarija 4
46
47
Published: 1996
Superior document: Enciklopedija Bălgarija 7
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
Published: 1971
56
Published: [1998]-
57
“...Bălgarska akademija na naukite...”
58
“...Bălgarska akademija na naukite...”
59
“...Bălgarska akademija na naukite...”
60
“...Bălgarska akademija na naukite...”