TY  - BOOK
AU  - Petersen,Morris S.
AU  - Rigby,J.Keith
TI  - Interpreting earth history: a manual in historical geology 
SN  - 0697282902
PY  - 1999///
CY  - Boston
PB  - WCB McGraw-Hill
KW  - Historical geology
KW  - Problems, exercises, etc
ER  -