TY  - BOOK
AU  - Marquis,Ralph William
ED  - Graduate School, USDA.
TI  - Environmental improvement: air, water, and soil,
AV  - TD180 .M3
U1  - 628 
PY  - 1966///]
CY  - [Washington]
PB  - Graduate School, U.S. Dept. of Agriculture
KW  - Pollution
N1  - Text of the lectures presented at the lecture series, Environmental improvement, U.S. Dept. of Agriculture, May 1966
ER  -