http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
what have we learned about PM since 1997? : executive summary
Title from title screen (viewed on Mar. 16, 2009).
Mode of access: Internet from the EPA web site. Address as of 3/16/09: http://www.epa.gov/pmresearch/pm%5Fresearch%5Faccomplishments/pdf/pm%5Fexecutive%5Fsummary.pdf ; current access available via PURL.
Includes bibliographical references (page 54).