Title: Gri͡azevye vulkany Sovetskogo Soi͡uza i ikh svi͡azʹ s genezisom nefti͡anykh mestorozhdenii͡u Krymsko-Kavkazskoĭ geologicheskoĭ provint͡sii
Subjects: Mud volcanoes, Petroleum, Geology
Places: Former Soviet republics, Ukraine, Crimea, Caucasus