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The 3R's - Radiofrequencies, Radio Spectrum & Radiation
Radio Spectrum – British Astronomical Association
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The United States Frequency Allocation Chart
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Antenna Series Part 2: Making sense of the radio frequency spectrum system - Barrett Communications
What is Radio Spectrum? | US Department of Transportation
Radio Frequency - Telecompedia
What is radio frequency (RF, rf)? - Definition from WhatIs.com
Radio Frequency Bands | TeraSense
