Mode of access: Internet from the USGS web site. Address as of 5/10/07: http://pubs.usgs.gov/of/2005/1233/pdf/ofr2005-1233.pdf ; current access is available via PURL.
Note
Title from title screen (viewed May 10, 2007)
"November 2005."
"This report is a product of the Long Term Resource Monitoring Program... USGS Upper Midwest Environmental Science Center"--P. [2].