Guidebook to the late Pliocene and early Pleistocene of NebraskaUniversity of Nebraska (Lincoln campus). Conservation and Survey Division, Nebraska Geological Survey · First published 1971Open the Tome
Conterminous U.S. land cover characteristics data set, 1990 prototypeUniversity of Nebraska--Lincoln. Conservation and Survey Division, Geological Survey (U.S.) · First published 1995Open the Tome
Illinois parts of INQUA guidebooks and supplemental data for field conference C : Upper Mississippi Valley; field conference GH. T. U. Smith, C. Bertrand Schultz, John C. Frye, H. B. Willman, International Association for Quaternary Research. Congress, Nebraska Academy of Sciences, Illinois State Geological Survey · First published 1965Open the Tome
