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Keywords: South African Geology - Schwarz - 1912 Fig 18.png en Figure from South African Geology - Schwarz - 1912 Page 87 Fig 18 Section through a Volcanic Neck the ash cone of which has been swept away by denudation Mimosa near Port Elizabeth 1912 File South African Geology - Schwarz - 1912 djvu Schwarz Ernest Hubert Lewis 1873-1928 other versions PD-old-70-1923 South African geology book |