TY - GEN AU - John P Wakefield C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1981-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.81-1641 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1981 TI - Addendum to earth terminal measurement system maintenance manual: ER -