TheNational Fire Protection Association pamphlet No. 52, 1992 edition, entitled "Standard for Compressed Natural Gas (CNG) Vehicular Fuel Systems," referred to in these rules as "the standard," is adopted by reference as part of these rules. For a copy of the referenced documents contact the National Fire Protection Association,  11 Tracy Drive, Avon, MA 02322, 02269, phone 800-344-3555 (ask for the library).