Condra, Geo. E. 1869-1958. Correlation of the Amerada Petroleum Company well drilled near Nehawka, Nebraska, by G. E. Condra. February, 1939. - [Lincoln] Published by authority of the state of Nebraska, 1939. - 16 p. LCCN: gs 39000134 Subjects--Topical Terms: Geology--Nebraska--Cass County. LC Class. No.: QE135 / .A43 no. 14