TY  - BOOK
AU  - Nelson,D L
TI  - Textbook of environmental engineering / 
SN  - 9788123928715
U1  - 628 
PY  - 2016///.
CY  - New Delhi : 
PB  - CBS Publishers, 
KW  - Environmental
KW  - engineering
N1  - Includes bibliographical references and index.
ER  -