The design of ventilated improved pit latrine /
Mara, D Duncan  
The design of ventilated improved pit latrine / D Duncan Mara. - Washington D.C : United Natiopons Development Programme, 1984. - iii, 73 p. ; 26 cm.
Pit latrines--Design
363.7294022 / MAR
                        The design of ventilated improved pit latrine / D Duncan Mara. - Washington D.C : United Natiopons Development Programme, 1984. - iii, 73 p. ; 26 cm.
Pit latrines--Design
363.7294022 / MAR
