(1972). Map showing mines, prospects, and areas of significant silver, lead, and zinc production in the Aspen quadrangle, Pitkin county, Colorado. U.S. Geological Survey.
Chicago-Zitierstil (17. Ausg.)Map Showing Mines, Prospects, and Areas of Significant Silver, Lead, and Zinc Production in the Aspen Quadrangle, Pitkin County, Colorado. Washington, D.C: U.S. Geological Survey, 1972.
MLA-Zitierstil (9. Ausg.)Map Showing Mines, Prospects, and Areas of Significant Silver, Lead, and Zinc Production in the Aspen Quadrangle, Pitkin County, Colorado. U.S. Geological Survey, 1972.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.