Алексей Петров & Иван Смирнов

Геология месторождений угля, битуминозных пород и торфа (1)

Ralph M. Feather Jr., PhD, Assistant Professor Geoscience Department ... & Susan Leach Snyder, Retired Teacher, Consultant Jones Middle ... & Dinah Zike, Educational Consultant Dinah-Might Activities, Inc., ... (...)

Lithology (1)

W.E. Medeiros & A.F. do Nascimento & F.C. Alves da Silva & N. Destro (...)

Technique and technology of exploration works (1)

Я.С. Бугров & С.М . Никольский

Астрофизика (1)