Technological development in lead and zinc production and their significance to developing countires 

 - New  York United Nations USA      1970 
 - 85p.  cm. 
<br/><br/><label>Standard No.: </label>95546 
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Iron and Steel Industry
<br/><br/><label>Dewey Class. No.: </label>"X9(F182):77p1(X),N69, L0/UN"