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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 Bureau Update Post-1990 Operations
"I" TIGER--Master Address File Building Operations