1. The International Standard Industrial Classification of All Economic Activities, Revision 3 is available from the Statistical Office of the United Nations, New York, New York.
2. Esther Pierce, “History of the Standard Industrial Classification:” (Washington, D.C. Executive Office of the President Office of Statistical Standards, U.S. Bureau of the Budget) (mimeograph).
3. For information regarding purchase of the NAICS Canada and NAICS Mexico manual, contact Statistics Canada, Ottawa, Ontario, Canada, and INEGI, Aguascalientes, Mexico.