TIGER/Line(TM) Files, 1992

                         Appendix H
                        Source Codes


The source codes specify the original sources of complete 
chains and landmark features.

  Value       Description

   " "        Not Documented Elsewhere
   "A"        Updated 1980 GBF/DIME-File
   "B"        USGS 1:100,000-Scale DLG-3 File
   "C"        Other USGS Map
   "D"        Census Bureau Update Prior to Enumeration 
              Operations
   "E"        Census Bureau Enumerator Update
   "F"        Census Bureau Update from Other Operations
   "G"        Unconfirmed Local Official Updates
   "H"        Census Update Post-1990 Operations