TY  - BOOK
TI  - Man's impact on environment
SN  - 0070165920
AV  - GF75 .D48
PY  - 1971///]
CY  - New York
PB  - McGraw-Hill
KW  - Nature
KW  - Effect of human beings on
KW  - Pollution
N1  - Includes bibliographies.
ER  -