TY  - BOOK
AU  - Marshak, Stephen
AU  - Leafgren, Rita
AU  - Marshak, Stephen And Leafgren
TI  - Essentials of Geology: study guide 
SN  - 039392422X
U1  - 551 
PY  - 2004///
CY  - New York
PB  - W. W. Norton & Co
KW  - Geology
ER  -