http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Traffic advisory practices at airports without operating control towers
Title from PDF caption (viewed Jan. 9, 2009).
AC 90-42E, dated November 23, 1988, is cancelled.
Mode of access: Internet at the FAA web site. Address as of 1/9/09: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/c54e50252a7fa56d862569d8007804ba/$FILE/ac90-42F.pdf ; current access available via PURL.
United States. Federal Aviation Administration.