Dunn, P.D. <br/><br/>
Appropriate technology : technology with a human face. 
by P.D.Dunn. 
 - London.  Macmillan.  c1978 
 - ix,220p.: ill. ; 21 cm. 
<br/><br/><label>Dewey Class. No.: </label>609.1724  / DUN