Johnson, B. R. (1986). Mineral resources of the Papa Keal and Zapata Creek Wilderness study areas, Alamosa County, Colorado.
Chicago Style (17th ed.) CitationJohnson, Bruce R. Mineral Resources of the Papa Keal and Zapata Creek Wilderness Study Areas, Alamosa County, Colorado. Washington, 1986.
MLA (9th ed.) CitationJohnson, Bruce R. Mineral Resources of the Papa Keal and Zapata Creek Wilderness Study Areas, Alamosa County, Colorado. 1986.
Warning: These citations may not always be 100% accurate.