TY - GEN AU - James R Ehrstein C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1985-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.260-93 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1985 TI - Standard Reference Materials ::Preparation and certification of SRM's for calibration of spreading resistance probes/ ER -