Não informado. (1939). Geological survey paper: Mines and geology branch. Department of Mines and Technical Surveys, Geological Survey.
Chicago-referens (17:e uppl.)Não informado. Geological Survey Paper: Mines and Geology Branch. Ottawa: Department of Mines and Technical Surveys, Geological Survey, 1939.
MLA-referens (8:e uppl.)Não informado. Geological Survey Paper: Mines and Geology Branch. Department of Mines and Technical Surveys, Geological Survey, 1939.
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