The geology of the country surrounding Vryheid
Subtitle: an explanation of sheet no. 102 (Vryheid)
By: by W.A. Humphrey ... and L.J. Krige ...
Contributors: Krige, Louis James; Geological Survey (South Africa)
Series: South Africa. Geological survey. [Sheet maps] Explanation of sheet -- 102
Publisher: The Govt. Printer
Published: 1932
Place of publication: Pretoria
Language: eng
Number of pages: 66
Subjects: Geology
Notes: At head of title: Union of South Africa. Department of Mines and Industries. Geological Survey.

"Bibliography," p. 60.