TY  - BOOK
AU  - Nelson, D. L.
TI  - Text book of environmental engineering 
SN  - 9788123928715
U1  - R 628 NEL(TEX) 
PY  - 2016///
CY  - New Delhi
PB  - CBS publishers & distributors pvt ltd.
KW  - ENVIRONMENTAL ENGINEERING
N1  - Includes index, glossary & reference
ER  -