1899. 2011-05-24T17:30:24Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
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1899. 2011-05-24T17:32:16Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
1896. 2011-05-24T17:28:19Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
1880. 2011-06-01T13:17:41Z. 2015-10-21T15:00:09Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
1899. 2011-05-24T17:18:35Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
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.).
1899. 2011-05-24T17:23:23Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
1898. 2011-05-24T15:12:54Z. 2015-10-21T14:59:50Z. Geological Survey (U.S.). The Survey. English. Public. Nebraska.
1896. 2011-05-24T14:36:30Z. 2015-10-21T14:59:50Z. Geological Survey (U.S.). The Survey. English. Public. Kansas and Nebraska.
1898. 2011-05-24T13:41:05Z. 2015-10-21T14:59:49Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Clay County (Neb.), Fillmore County (Neb.), Nebraska, Nuckolls County (Neb.), and Thayer County (Neb.).