TY - RPRT TI - Report of the 72nd National Conference on on Weights and Measures 1987 AU - Tholen, Albert D AU - Brickenkamp, Carroll S AU - Heffernan, Ann P PY - 1987 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS SP 734 DO - 10.6028/NBS.SP.734 ER -