11. Dates of latest prints, instrument approach procedure charts and airport obstruction plans (OP), eastern United States. Bookmark Corporate/Agency Authors: Coast and Geodetic Survey and Commerce Dept. Publisher: Coast and Geodetic Survey SuDoc number: C 4.9/19:(date)
12. Instrument approach procedure charts, including airport obstruction charts (OC) and turbine data sheets (T), eastern United States. Bookmark SuDoc number: C 4.9/19:(date)