TY - GEN AU - Andrew C Wall C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1964-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.RPT.8167 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1964 TI - Photometric characteristics of a lens cell of the Fresnel-Lens optical landing system: ER -