The sillimanite deposits in Namaqualand near Pofadder,
by D.H. de Jager and J.W. von Backström.
- Pretoria, Govt. Printer, 1961.
- 49 p. illus., maps (part fold.) diagrs., tables. 24 cm.
- Geological Survey (South Africa). Bulletin 33 .
- Bulletin (Geological Survey (South Africa)) ; 33. .