Water treatment and sanitation
Water treatment and sanitation :a handbook of simple methods for rural areas in developing countries / by H.T. Mann, D. Williamson
London :Intermediate Technology Publications ,1976
90 p. ,ill., plans ; 21 cm.
090303123X : 1.50
Water -- Purification
Sewage -- Purification
Rural health
Public health -- Developing countries
SRD Community Education Training Centre,