@book{996,
	author = {Armbrustmacher, Theodore J. and United States. Department of Energy},
	title = {Abundance and distribution of thorium in the carbonatite stock at Iron Hill,},
	publisher = {U. S. Govt. Print. Off.,},
	year = {1980},
	address = {Washington :},
	note = {Prepared in cooperation with the Department of Energy}
}