1999. 2002-06-01T04:00:00Z. 2005-02-18T21:45:23Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Black Hills (S.D. and Wyo.).
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1999. 2002-06-01T04:00:00Z. 2005-02-18T21:44:54Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Great Basin. Quaternary.
1999. 2012-07-20T20:34:08Z. 2022-12-08T04:40:36Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Pennsylvania, Bucks County, Lehigh County, and Northampton County.
1999. 2006-07-18T19:23:31Z. 2006-07-18T19:23:31Z. Nielson, Jane E. The Survey ; Information Services [distributor]. English. Public. California and San Bernardino County.
1999. 2006-07-18T19:24:08Z. 2006-07-18T19:24:08Z. Nielson, Jane E. The Survey ; Information Services [distributor]. English. Public. California and San Bernardino County.
1999. 2002-06-01T04:00:00Z. 2022-12-08T02:20:31Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Nevada and Nye County.
1999. 2002-06-01T04:00:00Z. 2022-12-08T02:20:31Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Virginia, Frederick County, Shenandoah County, and Warren County.
1999. 2002-06-01T04:00:00Z. 2022-12-08T02:20:31Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Maryland, Montgomery County, Virginia, Fairfax County, and Loudoun County.
1999. 2002-06-01T04:00:00Z. 2022-12-08T02:20:31Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Illinois, Alexander County, Missouri, and Scott County.
1999. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. Public. Ohio, Darke County, Preble County, and Lockport Group.