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- Geological Survey of Canada6
- U.S. Dept. of the Interior, Geological Survey4
- U.S. Geological Survey4
- The Survey3
- Province of Ontario, Dept. of Mines2
- United States, Department of the Interior, Geological Survey2
- Geological Survey1
- Geological Survey of Canada, Department of Mines and Technical Survey1
- Royaume de Belgique, Ministère des Colonies, Commission de Géologie1
- publisher not identified,G. Dufrénoy1
