"Oil fields." . . "OIL FIELDS." . "Petroli Geologia." . . "Campos petroleros." . . . . "PETROLEUM RESERVES." . . "gisement pétrole." . . "Erdöllagerstätte." . . "Erdöllagerstätte" . "Minéraux non-métalliques Technique minière." . . "Ölfeld." . . "Ölfeld" . . . . . . . . . . . . . "Oilfields of the world" . "Oilfields of the world"@en . . . . . . . . . . . . . . . "Oilfield of the World = mit 51 Abb. 100tab 2.ed" . . . . . . . "Oilfields of the world, by E. N. Tiratsoo" . . . . . . . . . . . . . . . . . . . . . . "Oilfields of the World" . . . "Pétrole Géologie." . . "Petroleum Geology." . . "Gisements pétrolifères." . . "Pétrole Industrie et commerce." . . "Terrenys petrolífers." . .