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United States Department of the Interior <br /> Bureau of Land Management <br /> Environmental Assessment <br /> Application for Competitive Mineral Materials Sale at Black <br /> Obsidian in Custer County, CO <br /> DOI-BLM-CO-F020-2020-0036 EA <br /> February 2021 <br /> United States Department of the Interior <br /> Bureau of Land Management <br /> Royal Gorge Field Office <br /> 3028 E. Main Street <br /> Canon City, CO 81212 <br />