Astronomicheski osnovi na pŭrvobŭlgarskoto letobroene.
Publisher: BAN
Published: 1974
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 92
Subjects: Chronology, Bulgaro-Turkic.
Other titles: Fondements astronomiques de l'ère protobulgare.
Notes: Bibliography: p. 89.
At head of title: Bŭlgarska akademii͡a︡ na naukite. Edinen t͡s︡entur za nauka i podgotovka na kadri po istorii͡a︡.
Added t.p.: Fondements astronomiques de l'ère protobulgare.
Summary in French and Russian.
Errata slip inserted.