Members of the expedition to the Kuril Islands to identify ore deposits with the richest sulfur composition of volcanic origin - Professor MA Menckovsky (right) and engineer BA Pushkarev examine sulfuric ore taken from the quarry (Aug. 1946): [photo] V. Baydalov. - August 1946. - 1 photo. - (Scientific expeditions of 1920-1940-ies Expeditions to Siberia and the Far East). - Russian State Archive of Film and Photo Documents. http://www.rgakfd.ru/.