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13 GEOLOGY OF THE HILL COUNTRY Having now in very brief outline presented some'of the principal facts concerning the Quaternary or Pleistocene Age with its glacial epochs, it will next be in order to speak of the driftsheet of the hill country, for it manifestly has but one and that only a meag...
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| Language: | unknown |
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State Historical Society of North Dakota
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| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndsl-books/id/55469 |