Razvitie na poshtenskite sŭobshtenii͡a︡ i poi͡a︡va na poshtenskite marki.
Contributors: Sŭi͡u︡z na bŭlgarskite filatelisti. Komisii͡a︡ za rabota s mladezhta.
Publisher: Sŭi͡u︡z na bŭlgarskite filatelisti, Komisii͡a︡ za rabota s mladezhta
Published: 1977
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 47
Subjects: Postal service -- History.; Postage stamps.