WHITE HOUSE CENTRAL FILES. CENTRAL REFERENCE UNIT FILES. Outgoing Correspondence Category Codes 10 Appointment 20 Condolence 30 Appreciation, Gift 31 Editorial Support 32 Appreciation, Political 33 Support, General Public 34 Appreciation, Civic 35 Post Election Support 36 Appreciation, Personal 38 Appreciation, Travel 40 Request 41 Directive 50 Congratulations 51 Religious Message 52 Birthday 54 Wedding Anniversary 55 Commendation 60 Acknowledgement 65 Resignation Acceptance 66 Retirement 70 Message 71 Get Well Message 72 Presidential Messages 80 General Good Wishes 85 Children’s Letters 93 Photo 94 Messages 95 Miscellaneous 96 Pres. Autopenned Signatures 97 First Lady’s Autopenned Signatures 98 Requests by Congressional Liaison