1966. 2012-01-03T15:27:09Z. 2012-03-05T17:27:49Z. Palmer, James Edward. U.S. Geological Survey. English. Public. Kentucky, Caldwell County, Crittenden County, and Hopkins County.
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1966. 2012-01-12T21:23:07Z. 2012-03-05T17:32:45Z. Trace, Robert Denny, 1917-. U.S. Geological Survey. English. Public. Kentucky, Crittenden County, and Caldwell County.
1966. 2012-01-03T15:31:32Z. 2012-03-05T17:27:49Z. Kehn, Thomas M. U.S. Geological Survey. English. Public. Kentucky, Webster County, Crittenden County, and Caldwell County.