Kalbermatten J M, Julius D S, Gunnerson C.G. <br/><br/>
Technical and economic options. 

 - 124p. 
 - (Appropriate technology for water supply and sanitation ; v. 1) .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water supply--Economics<br/>Sanitation--Economics<br/>Technology, appropriate