1. Geological map of the Union of South Africa : Geologiese kaart van die Unie van Suid Afrika Maps University Of Minnesota Public content 1925. Geological Survey (South Africa). In upper margin: Department of Mines and Industries, Geological Survey.; "Cartographer, Eric H. Banks." 141 x 190 centimeters, on sheets 77 x 102 c... Geological Survey Office (Pretoria).