TY  - BOOK
AU  - Ojakangas Richard W
AU  -  Darby David G
TI  - Earth: Past and present
T2  - McGraw Hall earth science paperback series
U1  - H, L63 
PY  - 1976///
CY  - New York    
PB  -  McGraw Hill       
KW  - Geology
ER  -