http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Prevention of retractable landing gear failures
Title from PDF file caption (viewed Sept. 25, 2008).
Mode of access: Internet at the FAA web site. Address as of 9/25/08: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/777228c04de00d0a862569c3004ba5c4/$FILE/AC20-34D.pdf ; current access available via PURL.