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Circular of the Bureau of Standards No. 557: Worldwide Radio Noise Levels Expected in the Frequency Band 10 Kilocycles to 100 Megacycles

W. Q. Crichlow

出版	U.S. Department of Commerce, National Institute of Standards and Technology, 1955
URL	http://books.google.com.hk/books?id=BD1NtAEACAAJ&hl=&source=gbs_api