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1Published 1964“...North Dakota. Geological Survey. Bulletin ;...”
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2Published 1967“...North Dakota. Geological Survey. Bulletin ;...”
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3Published 1968“...North Dakota. Geological Survey. Bulletin ;...”
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4Published 1962“...North Dakota. Geological Survey. Bulletin 36...”
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5Published 1967“...North Dakota. Geological Survey. Bulletin 49...”
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7
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8by Hutchinson, R. D. (Rickard D.)“...North Dakota Geological Survey. Bulletin 62, pt. 2...”
Published 1973
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