@book{27221,
	author = {Cross, Whitman, and Larson, Esper Signius,},
	title = {A brief review of the geology of the San Juan region of southwestern Colorado,},
	publisher = {U.S. Govt. print. off.,},
	year = {1935.},
	series = {U.S.  Geological survey.  Bulletin},
	address = {Washington,},
	note = {"Literature": p. 4-6.}
}