Census 2000 pl 94 171 techdoc
...(Public Law 94-171) Summary File Nancy A. Potok, Principal Associate Director...9–1 APPENDIXES A GeographicDefinitions ......................... A–1 B Definit
https://www.census.gov/content/dam/Census/programs-surveys/rdo/TechnicalDocumentation/Census2000_pl94-171_techdoc.pdf