1. Uses of Economic Census Data;Worden;Government Information Quarterly,1987
2. Conducting the Economic Censuses;Blum;Government Information Quarterly,1987
3. Title 44, United States Code, Sections 3501 through 3520.
4. U.S. Economic Censuses, 1810 to the Present;Bohme;Government Information Quarterly,1987
5. For a description of the SIC system, see Lawrence A. Blum et al., “Conducting the Economic Censuses.”