TY - GEN AU - Wall, A C AU - Douglas, C A C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1964-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.8169 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1964 TI - An investigation of beam-spreading techniques for semiflush-prismatic type airport-marker lights: ER -