TY - RPRT TI - Advanced mass calibration and measurement assurance program for state calibration laboratories: 2019 Edition AU - Fraley, Kenneth L AU - Harris, Georgia L PY - 2019 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 5672-2019 DO - 10.6028/NIST.IR.5672-2019 ER -