TY - GEN AU - Francis C Bell AU - Harold F Wollin C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1973-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.379 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1973 TI - Report of the 57th National Conference on Weights and Measures 1972: ER -