1980. 2015-02-27T18:55:24Z. 2015-03-10T22:10:28Z. Allen, Elizabeth G. U.S. Geological Survey. English. Public. Colorado, Nebraska, and Kansas.
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1980. 2015-02-27T15:27:30Z. 2015-03-10T22:10:25Z. Bateman, Andrew F. U.S. Geological Survey. English. Public. Montana and North Dakota.