TY - GEN AU - James H Walker AU - Robert D Saunders AU - John K Jackson AU - Donald A McSparron C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1987-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.250-20 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1987 TI - Spectral irradiance calibrations: ER -