@book{29051,
	author = {Larsen, Esper S. and Cross, Whitman,},
	title = {Geology and petrology of the San Juan region, southwestern Colorado,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1956.},
	address = {Washington,},
	note = {Part of illustrative matter folded in pocket.}
}