TY - GEN AU - Kathryn Stephenson C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2017-08-01 04:08:00 DO - https://doi.org/10.6028/NIST.IR.8167-08 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2017 TI - NIST time and frequency bulletin: ER -