Penulis: Robert H. Watrel

J. Clark Archer is professor of geography at the University of Nebraska, Lincoln. Fiona Davidson is associate professor of geosciences at the University of Arkansas. Erin H. Fouberg is professor of geography at Northern State University. Kenneth C. Martis is professor of geography at West Virginia University. Richard L. Morrill is professor emeritus of geography at the University of Washington. Fred M. Shelley is professor of geography at the University of Oklahoma. Robert H. Watrel is associate professor of geography at South Dakota State University. Gerald R. Webster is professor of geography at the University of Wyoming.