http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Instrument flight rules enroute high altitude
"Published in accordance with Inter-agency Air Cartographic Committee specifications and agreements."
Each issue consists of 12 charts designated H-1 through H-12.
Chart becomes obsolete for use upon publication of next issue.
Consult Notices to airmen, NOTAMs, for latest information.
United States government flight information publication