TY  - BOOK
AU  - Watt, Kenneth E. F. ,1929-
TI  - Principles of environmental science
SN  - 0070685754
AV  - QH541.W28 
PB  - McGraw-Hill
KW  - Ecology
KW  - Human ecology
KW  - Environmental policy
KW  - QH
N1  - Includes bibliographies
ER  -