Mann, Henry Thomas
Water treatment and sanitation : a handbook of simple methods for rural areas in developing countries - 1976 Intermediate Technology Publications - 90 p. ill., plans 21 cm
090303123X
SANITATION
WATER TREATMENT
WATER SUPPLY
Water treatment and sanitation : a handbook of simple methods for rural areas in developing countries - 1976 Intermediate Technology Publications - 90 p. ill., plans 21 cm
090303123X
SANITATION
WATER TREATMENT
WATER SUPPLY