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  1.  
  2.  Over 77,000 bibliographic references of U.S. Geological                         
  3.  Survey reports and maps published from 1880 to date, and to                     
  4.  non-Survey publications with Survey authors published from                      
  5.  1983 to date.  Report chapters are cited separately.  Each                      
  6.  reference includes an average of 13.4 GeoRef index terms for                    
  7.  topics and locations.  Current prices are included for each                     
  8.  USGS publication in stock.                                                      
  9.                                                                                  
  10.                                                                                  
  11.