Also available via Internet from USGS web site. Address as of 3/8/06: http://pubs.usgs.gov/sir/2004/5236/pdf/SIR%5F2004-5236.pdf; current access available via PURL.
System requirements: Compatible computers must have a CD-Rom drive and be capable of displaying at least 256 colors. IBM-compatible running windows 98 SE or higher or NT 4.0 with SP5 or higher with an Intel Pentium or equivalent processor. Macintosh running Mac OS 9.1 or later with a Power PC or equivalent processor.