1897. 2011-05-24T14:40:10Z. 2015-10-21T14:59:50Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Adams County (Neb.), Franklin (Neb.), Franklin County (Neb.), Holstein (Neb.), Kansas, Kearney County (Neb.), Minden (Neb.), Nebraska, Red Cloud (Neb.), Republican River (Neb. and Kan.), Roseland (Neb.), Smith County (Kan.), and Webster County (Neb.).
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1898. 2011-05-24T17:26:05Z. 2015-10-21T14:59:51Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Adams County (Neb.), Blue Hill (Neb.), Clay County (Neb.), Fairfield (Neb.), Jewell County (Kan.), Kansas, Nebraska, Nelson (Neb.), Nuckolls County (Neb.), Republican River (Neb. and Kan.), and Webster County (Neb.).