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1by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1936
Book -
2by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1935
Book -
3by Reed, E. C. (Eugene Clifton), 1901-“...Nebraska Geological Survey paper ;...”
Published 1938
Book -
4by Condra, Geo. E. (George Evert), 1869-1958“...Nebraska Geological Survey paper ;...”
Published 1938
Book