Condra, Geo. E. (George Evert) 1869-1958 creator Scherer, Oliver Joseph 1906- joint author. Johnson, William Russell 1905- text bibliography nbu Lincoln University of Nebraska, Conservation and Survey Division 1939 monographic eng

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18 p. illus. by G. E. Condra and Oliver J. Scherer. With an annotated bibliography by W. R. Johnson. "Annotated bibliography": p. 16-18. Geology, Stratigraphic Carboniferous Geology Nebraska QE135 .A43 no. 16 gs 39000289 DLC 790615 20260227111345.0 gs 39000289