UL Subject 1746
Standard for External Corrosion Protection Systems For Steel Underground Storage Tanks (Bulletin, 9/25/2000)
standard by Underwriters Laboratories, 09/25/2000
UL Subject 971
Standard for Nonmetallic Underground Piping for Flammable Liquids (Bulletin, 9/8/2000)
standard by Underwriters Laboratories, 09/08/2000