"3/11/85." Title from PDF file caption (viewed Dec. 5, 2008).
Technical Details:
Mode of access: Internet at the FAA web site. Address as of 12/5/08: http://www.airweb.faa.gov/Regulatory%5Fand%5FGuidance%5FLibrary/rgAdvisoryCircular.nsf/0/cde80c2d647198bb862569b3005479a5/$FILE/AC25-1455-1.pdf; current access available via PURL.