U.S. Customs Service.
Carl E. Prince
Unknown Author
U.S. Customs Service
U.S. Customs Service. Office of Enforcement Support. Research and Development Division
United States. General Accounting Office. General Government Division.
Frederick M Kaiser
Norman J. Rabkin
United States. General Accounting Office
United States. Congress. House. Committee on Merchant Marine and Fisheries. Subcommittee on Oversight and Investigations.