TY - GEN AU - T L Cummings AU - J Horlick C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1980-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.IR.80-1827 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1980 TI - Collaborative reference program for color and appearance ::color and color difference : report no. 30 ER -