Description
Item Description:Title from PDF title page (viewed on Aug. 21, 2008).
Electronic resource.
Physical Description:vi, 14 pages : digital, PDF file.
Format:Mode of access: Internet at the USGS. web site. Address as of 8/21/08: http://pubs.usgs.gov/sir/2005/5228/pdf/sir2005-5228.pdf ; current access is available via PURL.