TY - RPRT TI - Specifications and tolerances for reference standards and field standard weights and measures 4. specifications and tolerances for liquefied petroleum gas and anhydrous ammonia liquid volumetric provers AU - Harris, Georgia L PY - 1997 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST HB 105-4 DO - 10.6028/NIST.HB.105-4 ER -