The Grenola formation,
Condra, Geo. E. 1869-1958.
The Grenola formation, by G. E. Condra and C. E. Busby. - [Lincoln] Printed by the authority of the state of Nebraska, 1933. - 31 p. illus.
Bibliographical foot-notes.
gs 34000052
Geology--Nebraska.
QE135 / .A43 no. 1
The Grenola formation, by G. E. Condra and C. E. Busby. - [Lincoln] Printed by the authority of the state of Nebraska, 1933. - 31 p. illus.
Bibliographical foot-notes.
gs 34000052
Geology--Nebraska.
QE135 / .A43 no. 1