00984cam a22002651 4500 gs 32000041 DLC 20260227111336.0 761214s1931 nbuab b s001 0 eng c gs 32000041 (OCoLC)2622462 U. S. Geol. Survey. Libr. TxWB DLC premarc QE135 .A4 no. 6 Condra, Geo. E. (George Evert), 1869-1958. Correlation of the Big Blue series in Nebraska, by G. E. Condra and J. E. Upp. [Lincoln] Printed by authority of the state of Nebraska, 1931. 74, [2] p. incl. illus., map, tables. 25 cm. Nebraska. Geological survey. Bulletin 6, second ser. At head of title: University of Nebraska. "Annotated bibliography of the Big Blue series": p. 68-74. Geology Nebraska. Geology, Stratigraphic Permian. Upp, Jerry Eli, joint author. 26938 26938