Principles and methods for the provision of econom 

 - New York  United Nations USA         1976 
 - 24p.  cm. 
<br/><br/> Sales No.:E.76.11.E.25 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical
<br/><br/><label>Dewey Class. No.: </label>X 9(D55), L6/UN