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1by Simpson, Howard E. (Howard Edwin), 1874-1938“...North Dakota. Geological Survey. Bulletin ;...”
Published 1923
Book -
2by Simpson, Howard E. (Howard Edwin), 1874-1938“...North Dakota. Geological Survey. Bulletin ;...”
Published 1926
Book -
3by Simpson, Howard E. (Howard Edwin), 1874-1938“...North Dakota. Geological Survey. Bulletin ;...”
Published 1927
Book -
4by Simpson, Howard E. (Howard Edwin), 1874-1938“...North Dakota. Geological Survey. Bulletin ;...”
Published 1932
Book -
5by Simpson, Howard E. (Howard Edwin), 1874-1938“...North Dakota. Geological Survey. Bulletin ;...”
Published 1937
Book