TY - GEN AU - Simmons, Joe D C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1991-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.250e1991 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1991 TI - NIST calibration services users guide: ER -