Version history for:


  Hack, Daniel R., 2005, Issues and challenges in the 
       application of geostatistics and spatial-data 
       analysis to the characterization of sand-and-gravel 
       resources in Bliss, J.D., Moyle, P.R., and Long, 
       K.R., eds., Contributions to industrial-minerals 
       research:  U.S. Geological Survey Bulletin  2209-J, 
       18 p.


  Version 1.0


  October 18, 2005

  fixed some typos


  March 4, 2005

  Initial release online at
  http://pubs.usgs.gov/bul/b2209-j/