1899. 2011-05-24T15:06:22Z. 2015-10-21T14:59:50Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Cozad (Neb.), Dawson County (Neb.), Frontier County (Neb.), Gosper County (Neb.), Lexington (Neb.), Nebraska, Phelps County (Neb.), and Platte River (Neb.).
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1896. 2011-05-24T13:35:04Z. 2015-10-21T14:59:49Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Alma (Neb.), Bloomington (Neb.), Franklin County (Neb.), Harlan County (Neb.), Holdrege (Neb.), Kansas, Kearney County (Neb.), Nebraska, Orleans (Neb.), Phelps County (Neb.), Phillips County (Kan.), Republican City (Neb.), Republican River (Neb. and Kan.), Smith County (Kan.), and Wilcox (Neb.).
