1965. 2012-09-27T19:18:55Z. 2013-03-18T22:20:21Z. Freeman, Val L., 1926-. U.S. Geological Survey. English. Public. Texas and Val Verde County.
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1965. 2012-09-27T20:05:58Z. 2013-03-18T22:20:22Z. Sharps, Joseph A. Interior--Geological Survey. English. Public. Texas and Val Verde County.