Title from HTML title screen (viewed on Sept. 24, 2001).
Bibliography Note:
Includes bibliographical references.
Technical Details:
Mode of access: Internet from the USGS Web site. Address as of 2-1-02: http://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-01-0315/ofr-01-0315.pdf.; current access is available via PURL. System requirements: Adobe Acrobat Reader.