Helgren, David M., 1947- <br/><br/>
Rivers of diamonds  an alluvial history of the lower Vaal Basin, South Africa 
by David M. Helgren 
 - Chicago  The University of Chicago  1979 
 - 389p. ill. 23cm. 
 - Research paper / University of Chicago, Department of Geography  no.185 .
<br/><br/><label>LCCN: </label>79-17790 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geomorphology--South Africa--Vaal River watershed<br/>Sediments (geology)--South Africa--Vaal River watershed