Title from HTML title screen (viewed Jan. 24, 2005).
Includes bibliographical references.
Mode of access: Internet from the USGS web site. Address as of 1/9/08: http://pubs.usgs.gov/ds/2004/90/A/; current access via PURL.
System requirements: Supported browsers, Netscape 4.7+ series and higher, Netscape 6.1+ series and higher, Netscape 7.1+ series and higher, Internet Explorer 5.x series and higher, Internet Explorer 6.x series and higher. Supported platforms, Windows 98, ME, 2000, and XP Macintosh OS X (Using Netscape 7.x or higher). Internet Explorer is not supported on any Macintosh platform. In addition, earlier Macintosh platforms may or may not function appropriately using Netscape 7.x or higher. Bandwidth, the use of 56k standard modem technology is not recommended for use with GCG online. While the application may function using a 56k modem, performance may be undesirable. The use of a 10mb LAN or higher or highspeed cable or DSL modem is recommended. Can be used with a GIS for more advanced functions.