Kosmicheskite prostori na progresa
Subtitle: chetvŭrt vek ot poleta na Pŭrvii͡a︡ sŭvetski izkustven spŭtnik na Zemi͡a︡ta
By: Kiril B. Serafimov.
Publisher: Obshtonaroden kom-t za bŭlgarsko-sŭvetska druzhba
Published: 1982
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 83
Subjects: Astronautics -- History.
Notes: Includes bibliographical references.