Ludington, S., & Ellis, C. E. (1981). Mineral resource potential of the Hunter-Fryingpan Wilderness and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. The Survey.
Chicago Style (17th ed.) CitationLudington, Steve, and Clarence E. Ellis. Mineral Resource Potential of the Hunter-Fryingpan Wilderness and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. Reston, Va.: The Survey, 1981.
MLA (9th ed.) CitationLudington, Steve, and Clarence E. Ellis. Mineral Resource Potential of the Hunter-Fryingpan Wilderness and the Porphyry Mountain Wilderness Study Area, Pitkin County, Colorado. The Survey, 1981.
Warning: These citations may not always be 100% accurate.