TY - GEN AU - J C Hughes C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1954-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.555 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1954 TI - Circular of the Bureau of Standards no. 555::testing of hydrometers ER -