Rules and regulations
Federal Communications Commission
United States Government Printing Office
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United States Government Printing Office 1964 Rules and regulations / Federal Communications Commission v. 4, Pt. 81, 83, 85
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United States Government Printing Offive 1949 Rules and regulations / Federal Communications Commission title 47-telecommunication-chapter 1, Pt. 33
United States Government Printing Offive 1949 Rules and regulations / Federal Communications Commission title 47-telecommunication-chapter 1, Pt. 31