   U.S. Geological Survey, Digital Spectral Library: Version 6 

      Roger N. Clark, Gregg A. Swayze, Andrea Gallagher, 
           Trude V.V. King, and Wendy M. Calvin 

             U.S. Geological Survey, MS 964 
                Box 25046 Federal Center 
                 Denver, CO 80225-0046 
                    (303) 236-1332 


Electronic mail: 

rclark@usgs.gov               # Internet 

