@book{27662,
	author = {Hall, A. L.},
	title = {A subject index to the literature of South African geology and mineral resources for the years 1921 to 1935 (inclusive) :},
	publisher = {Govt. Printer,},
	year = {1939.},
	series = {Geological Survey memoir ;},
	address = {Pretoria :},
	note = {At head of title: Union of South Africa, Department of Mines.}
}