Description
Item Description:Title from title screen (viewed on May 1, 2009).
Electronic resource.
Physical Description:2 unnumbered pages : digital, PDF file.
Format:Mode of access: Internet from the USGS web site. Address as of 5/1/09: http://pubs.usgs.gov/fs/2009/3024/fs2009-3024.pdf ; current access available via PURL.