Suggested citation and version history for:


  Billingsley, George H., Priest, Susan S., and Felger, 
       Tracey J., 2007, Geologic map of the Cameron 30' x 
       60' quadrangle, Coconino County, northern Arizona:  
       U.S. Geological Survey Scientific Investigations Map 
       2977, scale 1;100,000 
       [http://pubs.usgs.gov/sim/2007/2977/].



  December 20, 2007
  Fixed an error in one of the database layers which 
  affected the shapefile package (cm_shape.zip) and digital 
  dataset (cm_db.zip). 

  December 11, 2007
  Initial release online at
  http://pubs.usgs.gov/sim/2007/2977/