TY  - BOOK
AU  - Botkin,Daniel B.
AU  - Keller,Edward A.
TI  - Environmental studies: Earth as a living planet 
SN  - 0675204623
PY  - 1987///
CY  - Colombus
PB  - Merril Publishing Company
KW  - Ecology
KW  - Pollution
KW  - Environmental aspects
KW  - Conservation of natural resources
ER  -