Condra, Geo. E. 1869-1958. The geological section of Nebraska, by G. E. Condra and E. C. Reed. Current revisions, by E. C. Reed. - Lincoln, University of Nebraska, Conservation and Survey Division, 1959. - vii, 82 p. illus., maps. 25 cm. Includes bibliographies. LCCN: gs 68000016 //r882 Subjects--Topical Terms: Geology--Nebraska.Geology, Stratigraphic. LC Class. No.: QE135.A4