@book{25973,
	author = {Frood, G. E. B. and Hall, A. L.},
	title = {The nitrate occurrences in the districts of Prieska & Hay, Cape province /},
	publisher = {Argus print. and publ. co., ltd.,},
	year = {1919.},
	series = {Geological survey memoir ;},
	address = {Johannesburg :},
	note = {At head of title: Union of South Africa, Department of Mines and Industries.}
}