County Business Patterns C 3.204/4: Economic Census (1997): Auxiliaries, Excluding Corporate, Subsidiary, and Regional Managing Offices, Geographic Area Series, United States and States C 3.277: Economic Census (1997): Maps C 3.277: North American Industry Classification System: United States, 1997 PREX 2.6/2:IN 27/997/ Standard Industrial Classification Manual 1987 PREX 2.6/2:IN 27/987 Survey of Current Business C 59.11: