1890. 2011-05-17T17:04:55Z. 2015-10-21T14:59:19Z. Geological Survey (U.S.). The Survey. English. Public. Arapahoe County (Colo.), Denver Region (Colo.), Douglas County (Colo.), and Elbert County (Colo.).
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1890. 2011-05-31T14:28:31Z. 2015-10-21T15:00:05Z. Geological Survey (U.S.). The Survey. English. Public. Alleghany County (Va.), Bath County (Va.), Botetourt County (Va.), Natural Bridge Region (Va.), Rockbridge County (Va.), and Virginia.
