TY  - BOOK
AU  - Condra,GeoE.
AU  - Busby,Clarence Edward
TI  - The Grenola formation,
AV  - QE135 .A43 no. 1
PY  - 1933///
CY  - [Lincoln]
PB  - Printed by the authority of the state of Nebraska
KW  - Geology
KW  - Nebraska
N1  - Bibliographical foot-notes
ER  -