مؤلف: Ryan Weichelt

Robert H. Watrel is associate professor of geography at South Dakota State University. Ryan Weichelt is associate professor of geography at the University of Wisconsin–Eau Claire.Fiona Davidson is associate professor of geography at the University of Arkansas.John Heppen is professor of geography at the University of Wisconsin–River Falls.Erin H. Fouberg is professor of geography at Northern State University.J. Clark Archer is professor of geography at the University of Nebraska–Lincoln.Richard L. Morrill is emeritus professor of geography at the University of Washington.Fred M. Shelley is professor of geography at the University of Oklahoma.Kenneth C. Martis is emeritus professor of geography at West Virginia University.