TY - GEN AU - Kathryn Stephenson C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2018-09-01 04:09:00 DO - https://doi.org/10.6028/NIST.IR.8205-09 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2018 TI - NIST time and frequency bulletin - September: ER -