TY - BOOK ID - 146017863 TI - Study of optical system for airport traffic signal projector AU - Crouch, E. W. AU - United States. PY - 1954 PB - Gaithersburg, MD : U.S. Dept. of Commerce, National Institute of Standards and Technology, DB - UniCat KW - Airports KW - Airports KW - Traffic control KW - Display systems. KW - Traffic control KW - Display systems. UR - https://www.unicat.be/uniCat?func=search&query=sysid:146017863 AB - ER -