Geology of petroleum 2026-02-15T15:52:25+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Levorsen, A. I. (Arville Irving), 1894-1965 (A Series of books in geology, 1967)