TY - GEN AU - W Q Crichlow AU - R N Morton AU - W R Corliss C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1955-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.CIRC.557 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1955 TI - Circular of the Bureau of Standards no. 557::worldwide radio noise levels expected in the frequency band 10 kilocycles to 100 megacycles ER -