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15 cents antenna Audio-frequency Amplifier Unit August 21 B. S. Letter Circular Book of Wireless Bureau of Navigation Bureau of Standards calls consisting considerable number Corps Radio Communication Crystal Detector Customhouse described in Circular electrical insulating electron tube F. W. Grover Government Printing Office GOVERNMENT RADIO Henley Publishing inductance coils International Morse Code issued J. H. Dellinger J. M. Miller Loading Coil London M. B. Sleeper N. Y. Radio Norman W number followed Price Principles Underlying Radio Radio Communication Laws Radio Communication Pamphlet Radio Engineers radio interest radio publications Radio Receiving Outfits Radio Service Bulletin radio stations radio telegraphy Radio telephony receiving sets reception in radio Signal Corps Radio Standards Circular station license stations have calls Superintendent of Documents Supervisor of Radio telegraphy and telephony three letters tion transmitting station U. S. Supervisor Underlying Radio Communication wave length Wireless Age Wireless Press Inc Wireless Press Ltd Wireless telegraphy York