Figure 4. Statistics measuring most requested pages viewed from the Petroleum Research web server in April 1999. Pages that were part of the Digital Petroleum Atlas were among the most requested pages (positions 2, 4, 6, 9,10). Other highly requested pages on the Petroleum Research web server are portals (positions 1, 3, 8) that provide general access to the Digital Petroleum Atlas and other oil and gas information. Complete report for April 1999 is available online at http://www.kgs.ku.edu/usage/1999/apr_wt/default.htm.