@book{27432,
	author = {Söhnge, A. P. G. and South Africa.},
	title = {The geology and archaeology of the Vaal River Basin /},
	publisher = {Govt. Printer,},
	year = {1937.},
	series = {Geological survey memoir ;},
	address = {Pretoria :},
	note = {At head of title: Union of South Africa. Department of mines.}
}