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Getting Licensed - ARRL
Amateur Radio Service - Federal Communications Commission
Ham Radio Licenses - ARRL
How To Get Your Ham Radio License in 3 Simple Steps
Amateur radio licensing in the United States - Wikipedia
Examinations - Federal Communications Commission
Getting Licensed - Step by Step - American Radio Relay League
Getting Your Technician License - ARRL
Operator Class - Federal Communications Commission
Tech, General, or Extra License... What's the difference?