1897. 2011-05-24T15:10:31Z. 2015-10-21T14:59:50Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Big Blue River (Neb. and Kan.), Crete (Saline County, Neb.), Gage County (Neb.), Lancaster County (Neb.), Lincoln (Neb.), Nebraska, Saline County (Neb.), and Seward County (Neb.).
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1903. 2011-05-24T17:21:07Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Cass County (Neb.), Elmwood (Neb.), Greenwood (Neb.), Johnson County (Neb.), Lancaster County (Neb.), Little Nemaha River (Neb.), Nebraska, Nemaha County (Neb.), Otoe County (Neb.), Palmyra (Neb.), Syracuse (Neb.), and Weeping Water (Neb.).
