1898. 2018-07-02T20:11:18Z. 2018-09-05T19:28:05Z. Senécal, C. O. (Clovis Omer). Geological Survey of Canada. English. cartographic image. Public. Nova Scotia, Cape Breton (County), and Glace Bay Region. Carboniferous.
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1951. 2018-01-23T15:55:42Z. 2018-01-23T15:55:42Z. Cohee, George Vincent, 1907-. U.S. Dept. of the Interior, Geological Survey. English. cartographic image. Public. Lower Peninsula (Mich.), Michigan, Lower Peninsula, and Lower Peninsula. Devonian, Carboniferous, and From 280 to 405 million years ago.