Description
Item Description:Title from PDF title page (viewed on Aug. 25, 2008).
Electronic resource.
Physical Description:vi, 69 pages : digital, PDF file.
Format:Mode of access: Internet at the USGS web site. Address as of 8/25/08: http://pubs.usgs.gov/sir/2005/5196/pdf/SIR%202005-5196%5FWeb.pdf ; current access is available via PURL.