Title from title screen (viewed on Sept. 5, 2003) "Prepared for Office of Air Quality Planning and Standards." "April 2001." "EPA/600/R-01/031."
System requirements: Adobe Acrobat Reader required. Mode of access: Internet from the EPA Office of Research and Development web site. Address as of 9/5/2003: http://www.epa.gov/ORD/NRMRL/Pubs/600R01031/600R01031.pdf; current access available via PURL.