http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Particulate matter urban-focused visibility assessment
Office of Air Quality Planning and Standards.
1 online resource (246 unnumbered pages) : illustrations (some color)
Title from title screen (viewed May 12, 2010).
United States. Environmental Protection Agency. Office of Air Quality Planning and Standards.