TY  - BOOK
AU  - Indian Standards Institution[ISI]
TI  - IS:8419-(Pt.1)-1977. Indian standard requirements for filtration equipment. Pt.1 : filtration media-sand and gravel
U1  - IS Code 
PY  - 1984///
CY  - New Delhi
PB  - Indian Standards Institution
N1  - ENG
ER  -