TY  - BOOK
AU  - Duggal, K N
TI  - Elements of environmental engineering
SN  - 8121915473
PB  - New Delhi
KW  - Environmental engineering
KW  - Sewerage and sewage treatment
KW  - Water  Quantity
KW  - Water supply  Sources
KW  - Water supply and drainage  buildings
KW  - Water treatment
N1  - Includes bibliographical references and index
ER  -