1968. 2012-10-09T19:26:01Z. 2013-03-18T22:22:39Z. Warren, David H. Dept. of the Interior, U.S. Geological Survey. English. Public. California, Arizona, Utah, Nevada, Southwest, New, and Southwest, New.
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1968. 2012-10-10T14:07:57Z. 2013-03-18T22:22:42Z. Warren, David H. Dept. of the Interior, U.S. Geological Survey. English. Public. Great Plains and West (U.S.).