INSTAAR-an Earth and Environmental Systems Institute, U. Colorado, 1560 30th Street, Boulder, CO 80309 United States ; Applied Geology, Delft University of Technology, Mijnbouwstraat 120, Delft, 2628 RX Netherlands
Geomorphology Laboratory, Indiana State U., 159 Science Building, Terre Haute, IN 47809 United States
INSTAAR-an Earth and Environmental Systems Institute, U. Colorado, 1560 30th Street, Boulder, CO 80309 United States
INSTAAR-an Earth and Environmental Systems Institute, U. Colorado, 1560 30th Street, Boulder, CO 80309 United States