TY - GEN AU - Stephenson, Kathryn C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2018-07-01 04:07:00 DO - https://doi.org/10.6028/NIST.IR.8205-07 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2018 TI - NIST time and frequency bulletin - July: ER -