TY  - BOOK
AU  - Botkin, Daniel B.
AU  - Keller, Edward A. 
TI  - Environmental science: earth as a living planet
SN  - 0471321737
AV  - GE 105 .B68 2000 
PY  - 2000///
CY  - New York
PB  - John Wiley & sons
ER  -