TY - GEN AU - Lashof, T W AU - Macurdy, L B C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1978-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.78-1476 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1978 TI - Precision laboratory standards of mass and laboratory weights: ER -