@book{26738,
	author = {Nel, Louis T. and Geological Survey (South Africa)},
	title = {The geology of the Postmasburg manganese deposits and the surrounding country.},
	publisher = {The Government printer,},
	year = {1929.},
	address = {Pretoria :},
	note = {At head of title : Union of South Africa. Department of mines and industries. Geological survey.}
}