System requirements: Computer system with CD-ROM drive; Adobe Acrobat Reader (included on disk). Title from title screen. "March 2004"--Disc label. Includes bibliographical references and index. Also available via Internet from the BLM web site. Address as of 5/25/04: http://www.id.blm.gov/shoshone/craters/index.htm; current access is available via PURL. 1 CD-ROM : col. ; 4 3/4 in.