Polezni izkopaemi na NR Bŭlgarii͡a︡
Subtitle: neft i gaz.
Contributors: Balukhovsk̓yĭ, Mykola Pylypovych, joint author.
Publisher: Tekhnika
Published: 1961
Place of publication: Sofia
Language: bul
Number of pages: 119
Subjects: Petroleum -- Geology -- Bulgaria; Natural gas -- Geology -- Bulgaria
Notes: Bibliography: p. 108-110.
At head of title: Ĭ. Sm. Ĭovchev i N. F. Balukhovski.
Summaries in Russian and English.