http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Visibility in mandatory Federal Class I areas, 1994-1998
Office of Air Quality Planning and Standards.
Mode of access: Internet from the EPA web site. Address as of 4/26/02: http://www.epa.gov/oar/visibility/report/; current access is available via PURL.
Visibility in mandatory Federal Class I areas (1994-1998)