http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Title from PDF caption (viewed Apr. 15, 2009).
Mode of access: Internet at the FAA web site. Address as of 4/15/09: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/91e881d455a45f51862569ee005a4f1d/$FILE/AC413-1.pdf ; current access available via PURL.