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: Jena : Diederichs, 1913
Book
7
Published in: Statističeski godišnik na bălgarskite dăržavni želěznici i pristanišča
1939(1941)
Book
8
9
Published: Hamburg : Hanseatische Verl.-Anst, 1924
Book
10
Published: Hamburg : Hanseatische Verlags-Anstalt, 1925
Book
11
Published: Jena : Diederichs, 1914
Book
12
13
Published: [Hannover] : Helge Lindau, 2007
Video
14
15
Published: Sofija, 1941-1941
Journal
16
17
Published: Berlin : Salzgeber, 2016
Video
18
19
20