1
Published: Sofija : Litavra, 1998
Serial
2
Serial
3
Published: Sofija : Klub '90, 1995
Serial
4
Published: Sofija : Klub '90, 1994
Serial
5
6
Published in: Statističeski godišnik na bălgarskite dăržavni želěznici i pristanišča
1939(1941)
Book
7
Book
8
9
Published: Beograd : Federal Secretariat für Information, 1963
Book
10
11
12
Published: [Hannover] : Helge Lindau, 2007
Video
13
14
Published: Sofija, 1941-1941
Journal
15
16
Published: Berlin : Salzgeber, 2016
Video
17
18
19
20
Book