24 Va. Admin. Code § 5-20-9999
Advisory Circular, AC No. 150/5390–2B, Subject: Helicopter Design, September 30, 2004, Federal Aviation Administration, U.S. Department of Transportation, 800 Independence Avenue, SW, Washington, DC 20591
Advisory Circular, AC No.: 150/5395–1, Subject: Seaplane Bases, June 29, 1994, Federal Aviation Administration, U.S. Department of Transportation, 800 Independence Avenue, SW, Washington, DC 20591