@book{218620,
	author = {Geological Survey (U.S.)  },
	title = {Mineral commodity summeries},
	publisher = {U.S. Dept. of the Interior, Bureau of Mines},
	year = {1978-},
	address = {Washington, D.C.},
	note = {Issued also to depository libraries in microfiche, -1996; not distributed to depository libraries in microfiche, 1997},
	url = {http://purl.access.gpo.gov/GPO/LPS5131}
}