TY  - BOOK
AU  - Duggal,K.N.
TI  - Elements of environmental engineering
SN  - 8121915473
U1  - 628.21 23
PY  - 2007///
CY  - New Delhi
PB  - S. Chand & Co. Ltd.
KW  - Environmental engineering
KW  - Sewage
KW  - Environmental aspects
N1  - Includes index
UR  - https://books.google.com.my/books?id=fWJzzZoJpSYC&printsec=frontcover&source=gbs_ViewAPI&redir_esc=y#v=onepage&q&f=false
ER  -