Description
Item Description:Title from title screen (viewed May 19, 2009).
"April 2007."
"EPA/600/R-07/041."
Electronic resource.
Physical Description:xxv, 202 pages : digital, PDF file.
Format:Mode of access: Internet from the EPA web site. Address as of 5/19/09: http://www.epa.gov/esd/tsc/images/proucl4technical.pdf ; current access available via PURL.