Poshtenskite kleĭma i pechati na Sofii͡a︡ prez pŭrvata polovina na XX vek
By: Panaĭot Kurdalanov, Ĭordan Kozarev.
Contributors: Kozarev, Ĭordan.
Publisher: Sŭi͡u︡z na Bŭlgarskite filatelisti, Nauchno-informat͡s︡ionen t͡s︡entŭr po filatelii͡a︡
Published: 1989
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 99
Subjects: Postmarks -- Bulgaria -- Sofii͡a︡ -- History -- 20th century.
Notes: Includes bibliographical references (p. 91-92).
Summary in English.