Bulgaria
| Picture | Title/Author | Language |
| Catalog Bulgaria-export Author: …… | German | |
 | Katalog bulharskych nálepek II. di 1957 – 1967 Author: …… | German |
 | Bulgarien, teil II 1946 – 1973 Author: …… | Bulgarien |
| Picture | Title/Author | Language |
| Catalog Bulgaria-export Author: …… | German | |
| Katalog bulharskych nálepek II. di 1957 – 1967 Author: …… | German |
| Bulgarien, teil II 1946 – 1973 Author: …… | Bulgarien |