Geological Survey Pretoria Co. <br/><br/>
Mineral resources of the union of South Africa 

 -  1936 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>54300 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Economic geology<br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H7.63, G6