TY - RPRT TI - Simulation of air traffic control radar beacon code assignment plans : final report on phase I AU - Elbourn, R D AU - Gilsinn, Judith F PY - 1969 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS RPT 10117 DO - 10.6028/NBS.RPT.10117 ER -