Mode of access: Internet from the USGS web site. Address as of 1/17/08: http://pubs.usgs.gov/ds/2006/184/ ; current access via PURL. System requirements: PC with Internet access and Adobe Acrobat Reader to access text files, and ArcInfo software with tar utility to access database files.
General Note:
Title from HTML index page (viewed on July 20, 2006).
Additional Physical Form:
Previously published in 1987 as printed map, Miscellaneous investigations series map I-1661 (also available online).