TY  - BOOK
AU  - Botkin, Daniel B
AU  - Keller, Edward A
TI  - Environmental studies
SN  - 675098130
CY  - Columbus
KW  - Biosphere
KW  - Ecosystems
KW  - Environmental economics
KW  - Environmental ethics
KW  - Environmental law
KW  - Environmental planning
KW  - Human population
ER  -