1983. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Open-File Services Section, Western Distribution Branch. English. Public. Arkansas.
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1985. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; Open-File Services Section, Western Distribution Branch. English. Public. Arkansas.
1986. 2002-06-01T04:00:00Z. 2009-02-23T19:26:42Z. Geological Survey (U.S.). The Survey ; Open-File Services Section, Western Distribution Branch. English. Public. Arkansas.