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U.S. DEPARTMENT OF THE INTERIOR

BRUCE BABBITT, Secretary


U.S. GEOLOGICAL SURVEY


Dallas L. Peck, Director



















For additional information                      Copies of this report may be 
write to:                                       purchased from: 

District Chief                                  U.S. Geological Survey 
U.S.Geological Survey, WRD                      Books and Open-File Reports 
3916 Sunset Ridge Road                          Federal Center, Box 25425 
Raleigh, North Carolina 27607                   Denver, Colorado 80225