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1“...Nebraska Geological Survey paper ;...”
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2“...Nebraska Geological Survey paper ;...”
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3“...Nebraska Geological Survey paper ;...”
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4“...Nebraska Geological Survey paper ;...”
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5“...Nebraska Geological Survey paper ;...”
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7by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1935
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8by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1936
Book -
9by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1939
Book -
10“...Nebraska Geological Survey paper ;...”
Book -
11by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1935
Book -
12by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1939
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13by Reed, E. C. (Eugene Clifton), 1901-“...Nebraska Geological Survey paper ;...”
Published 1938
Book -
14by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1938
Book -
15
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16
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