TY  - BOOK
AU  - Botkin,Daniel B  .
AU  - Keller,Edward A  .
TI  - Environmental Stdies : the earth as a living planet / 
U1  - 372.357 
PY  - 1982///
CY  - Columbus : 
PB  - Charles E.Merrill Publishing , 
KW  - ENVIRONMENTAL SCIENCE
N1  - Includes index
ER  -