@book{27241,
	author = {Kupferbürger, Wilhelm,},
	title = {Corundum in the Union of South Africa,},
	publisher = {The Government Printer,},
	year = {1935.},
	series = {South Africa. [Geological survey] Geological series. Bulletin},
	address = {Pretoria,},
	note = {At head of title:  Union of South Africa. Department of Mines.}
}