TY  - BOOK
AU  - Kummel,Bernhard
TI  - History of the earth: an introduction to historical geology 
PY  - 1968///
CY  - San Francisco
PB  - W.H. Freeman
KW  - Earth
KW  - Geology, Stratigraphic
KW  - Paleontology
N1  - Includes bibliographical references
ER  -