This final rule amends the Antitrust Improvements Act Notification and Report Form ("Form") which must be completed and submitted by persons required to report mergers and acquisitions pursuant to section 7A of the Clayton Act, as added by the Hart-Scott- Rodino Antitrust Improvements Act of 1976 ("HSR Act"). The telephone number for the Bureau of the Census appearing on the Instructions in the Interim Rules will be deleted as this telephone number is no longer referenced on the Bureau of the Census web page. Persons requiring information on NAICS should refer to the Census web page at www.census.gov. Otherwise, this final rule implements the Interim Rules as published on May 9, 2001.