Helgren, David M. <br/><br/>
Rivers of diamonds : an alluvial history of lower vaal  basin, S. Africa 

 - Chicago  Univ. Of Chicago  1979 
 - xix, 389p, figs 
 - Univ, Of Chicago Dept, At Geography Res. Papers No.185 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>U21:63
<br/><br/><label>Dewey Class. No.: </label>U21:63  / K9