Mara, D Duncan  <br/><br/>
The design of ventilated improved pit latrine /  
D Duncan Mara. 
 - Washington D.C :  United Natiopons Development Programme,  1984. 
 - iii, 73 p. ;  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pit latrines--Design
<br/><br/><label>Dewey Class. No.: </label>363.7294022   / MAR