1964. 2012-09-26T19:14:32Z. 2013-03-18T20:29:47Z. Freeman, Val L., 1926-. Interior--Geological Survey. English. Public. Texas and Val Verde County.
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1963. 2012-09-21T15:43:32Z. 2013-03-18T22:19:19Z. Sharps, Joseph A. Interior--Geological Survey. English. Public. Texas, Terrell County, and Val Verde County.
1965. 2012-09-27T20:05:58Z. 2013-03-18T22:20:22Z. Sharps, Joseph A. Interior--Geological Survey. English. Public. Texas and Val Verde County.