1905. 2011-05-31T14:11:43Z. 2015-10-21T15:00:05Z. Geological Survey (U.S.). The Survey. English. Public. Culpeper County (Va.), Fauquier County (Va.), Luray Region (Va.), Madison County (Va.), Page County (Va.), Rappahannock County (Va.), Shenandoah County (Va.), Virginia, and Warren County (Va.).
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1912. 2011-05-31T17:26:12Z. 2015-10-21T15:00:06Z. Geological Survey (U.S.). The Survey. English. Public. Page County (Va.), Rockingham County (Va.), Shenandoah County (Va.), Virginia, West Virginia, and Woodstock Region (Shenandoah County, Va.).