http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Office of Air Quality Planning and Standards.
Title from title screen (viewed on Aug. 18, 2006).
Mode of access: Internet from the EPA web site. Address as of 6/11/07: http://www.epa.gov/oar/visibility/pdfs/haze_brochure_20060426.pdf; current access via PURL.