TY - GEN AU - Durst, Richard A C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1975-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.260-53 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1975 TI - Standard Reference Materials ::Standardization of pH measurements/ ER -