1. Professor of geography at the University of Alabama, Tuscaloosa, Alabama 35487–0322; [shankman@bama.ua.edu].
2. Associate professor of geography at Texas A&M University, College Station, Texas 77843; [clafon@geog.tamu.edu].
3. Professor of geography at Louisiana State University, Baton Rouge, Louisiana 70803; [keim@lsu.edu].