TY  - BOOK
AU  - Leach, Hesser .-
TI  - Focus on Earth Science
SN  - 0675026717
U1  - 550 HES 
PY  - 1989///
CY  - U.S.A
PB  - Merrill publishers
KW  - Earth sciences
KW  - Earth sciences--Study and teaching
N1  - includes; appendix
ER  -