TY - GEN AU - Jack J Hsia AU - William H Venable Jr AU - Victor R Weidner C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1976-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.TN.594-11 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1976 TI - Optical radiation measurements::development of an NBS reference spectrophotometer for diffuse transmittance and reflectance ER -