Polezni izkopaemi na NR Bŭlgarii͡a︡
An edition of Polezni izkopaemi na NR Bŭlgarii͡a︡ (1960)
vŭglishta i bituminozni shisti.
By Ĭovcho Smilov Ĭovchev
Publish Date
1960
Publisher
Tekhnika
Language
bul
Pages
131