http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
prepared by FAA Civil Aeromedical Institute, Aeromedical Education Division.
Mode of access: Internet from the FAA web site. Address as of 8/26/99: http://162.58.27.106/aam-400a/400altitude.html; current access available via PURL.