Ventilated improved double-pit latrinc: a construction manu-al for Botswana / John Van Nostrand and James G. Wilson.
Nostrand, John van.
Ventilated improved double-pit latrinc: a construction manu-al for Botswana / John Van Nostrand and James G. Wilson. - Washington. : World Bank - 47 p. - Technical note; no. 3 .
Ventilated improved double-pit latrinc: a construction manu-al for Botswana / John Van Nostrand and James G. Wilson. - Washington. : World Bank - 47 p. - Technical note; no. 3 .