TY  - BOOK
AU  - Hasser,Dale T.
AU  - Leach,Susan S.
TI  - Focus on earth science / 
SN  - 0675026717
U1  - 550 
PY  - 1989///
CY  - Columbus, Ohio
PB  - Merrill
KW  - Earth sciences
N1  - 500-599; 550
ER  -