Nel, Louis T.  1895- <br/><br/>
The geology of the Postmasburg manganese deposits and the surrounding country.  An explanation of the geological map / 
by Louis T. Nel. 
 - Pretoria :  The Government printer,  1929. 
 - 109 p., [XII] leaves of plates :  ill., map ;  25 cm. 
<br/><br/> At head of title : Union of South Africa. Department of mines and industries. Geological survey. 
<br/><br/><label>LCCN: </label>gs 29000242  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Manganese ores--South Africa.<br/>Geology--South Africa--Postmasburg.
<br/><br/><label>LC Class. No.: </label>TN490.M3  / N4