@book{29666,
	author = {Steyn, J. G. D.},
	title = {Tysonite from Mutue Fides.},
	publisher = {Printed by and obtainable from the Govt. Printer,},
	year = {c1961.},
	series = {South Africa. Geological Survey. Bulletin},
	address = {Pretoria,},
	note = {Summary in Afrikaans.}
}