Schwellnus, C. M.  1911- <br/><br/>
Vermiculite deposits in the Palaboroa area, N. E. Transvaal, 
by C. M. Schwellnus ... Publication of the Geological Survey Division. 
 - Pretoria,  The Government Printer,  1938. 
 - 27 p.  incl. illus. (maps) tables, diagrs.  24 cm. 
 - South Africa. Geological Survey. Geological series. Bulletin  no. 11 .
 - Geological series.  Bulletin (South Africa.  Geological Survey Division) ;  no. 11. .
<br/><br/> At head of title: ... Union of South Africa.  Department of Mines. 
<br/><br/>Bibliographical foot-notes. 
<br/><br/><label>LCCN: </label>gs 40000174  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vermiculite.<br/>Mines and mineral resources--South Africa--Transvaal.
<br/><br/><label>LC Class. No.: </label>QE325  / .A53 no. 11