Technical papers   Document techniques.    

 - New York  United Nations USA         1972 
 - iii, 172p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minerals
<br/><br/><label>Dewey Class. No.: </label>X9(H1):27p1,N71, L2