Kni͡az Boris Pŭrvi.
Subtitle: Bŭlgarii͡a prez vtorata polovina na IX vek.  [Izsledvane.
By: S. Predg. ot Petŭr Khr. Petrov]
Publisher: Nauka i izkustvo
Published: 1969
Place of publication: Sofii͡a
Language: bul
Number of pages: 531
Subjects: Boris I, Khan of Bulgaria, d. 907; Bulgaria -- History -- Early to 1393
Notes: Includes bibliographical references.
Summary in French.