TY  - BOOK
AU  - Levin, Harold L.
TI  - The earth through time
SN  - 0030536898
U1  - GC 551.7 L578 1992 
PY  - 1992///
CY  - FortWort, TX
PB  - Saunders College Pub.
KW  - Historical geology
N1  - Includes index
ER  -