@book{26019,
	author = {Rastall, Robert Heron, and Wilcockson, William Howson,},
	title = {Tungsten ores,},
	publisher = {J. Murray,},
	year = {1920.},
	series = {[Great Britain] Imperial institute [London] Monographs on mineral resources with special reference to the British empire},
	address = {London,},
	note = {Prepared under the direction of the Mineral resources committee with the assistance of the scientific and technical staff of the Imperial institute.}
}