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Preliminary report on the clays and shales of Minnesota,

By Grout, Frank F..
Minneapolis, The University of Minnesota, 1914 .
viii, 175 p. , At head of title: The University of Minnesota. | In cooperation with the United States geological survey. 23 cm..

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The peat deposits of Minnesota,

By Soper, Edgar Kirke,.
Minneapolis, The University of Minnesota, 1919 .
ix, 261 p. , At head of title: The University of Minnesota ... In coöperation with the United States Geological survey and the United States Bureau of mines. 23 cm..

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