@book{30243,
	author = {Geological Survey (U.S.)},
	title = {Geology of parts of the upper Mississippi Valley zinc-lead district.},
	publisher = {U.S. Govt. Print. Off.},
	year = {[1960-1966]},
	series = {Bulletin},
	address = {Washington,},
	note = {Part of illustrative matter folded in pocket.}
}