TY  - BOOK
AU  - Watt,Kenneth E.F.,1929-
TI  - Principles of environmental science
SN  - 0070685754
PY  - 1973///
CY  - New York
PB  - McGraw-Hill
KW  - Ecology
KW  - Human ecology
KW  - Environmental policy
N1  - Includes bibliographies
ER  -