TY  - BOOK
AU  - Mann, H. T.
AU  - Williamson, D.
TI  - Water treatment and sanitation: A Handbook of simple methods for rural areas in developing countries
SN  - 0 903031 23 X
U1  - 628.16 
PY  - 1979///
CY  - London
PB  - Intermediate Technology
ER  -