Center for Earth-Surface Dynamics, University of Minnesota, St. Anthony Falls Laboratory 2 3rd Ave. SE, Minneapolis, MN 55414 United States ; University of North Carolina, Department of Geography, 326 Saunders Hall Box 3220, Chapel Hill, NC 27599 United States
Lawrence University, Department of Geology, P.O Box 599, Appleton, WI 54912 United States
Johns Hopkins University, Department of Geography and Environmental Engineering, 3400 N. Charles Street, Baltimore, MD 21218 United States
University of Minnesota, Department of Ecology, Evolution and Behavior, St. Paul, MN 55108 United States
University of North Carolina, Department of Geography, 326 Saunders Hall Box 3220, Chapel Hill, NC 27599 United States