TY - GEN AU - Becker, Genevieve C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1933-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.LCIRC.393 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1933 TI - Letter Circular 393::procedure for the measurement of the reflectance of manila rope fiber for light of wave length 500 millimicrons ER -