TY - GEN AU - Varner, Ruth N AU - Vezzetti, Carol F C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1991-01-01 05:01:00 DO - https://doi.org/10.6028/NIST.SP.260-114 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1991 TI - Standard Reference Materials ::Bright-chromium linewidth standard, SRM 476, for calibration of optical microscope linewidth measuring systems/ ER -