Title from PDF title screen (viewed on May 2, 2007).
Bibliography Note
Includes bibliographical references (pages 18-19).
Technical Details
Mode of access: Internet from the USGS web site. Address as of 11/7/07: http://pubs.usgs.gov/of/2007/1090/ofr2007-1090.pdf; current access via PURL.
Action Note
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