1. Geologic studies of the Platte River, south-central Nebraska and adjacent areas, geologic maps, subsurface study, and geologic history [electronic resource] Yale Public content 2005. 2006-04-26T14:05:13Z. 2011-03-03T23:34:11Z. Condon, Steven M. U.S. Geological Survey ; Information Services [distributor]. English. Public. Nebraska, Platte River Watershed, Wyoming, Colorado, and Kansas.