Text ( visual ) : unmediated 47th Annual Report/Fiscal Year 1981 / Federal Communications Commission. -- Washington, D.C. : U.S. Government Printing Office , [1982]. -- Viii, 125 p. : charts ; 26 cm. -- (BA55165218) ; https://ci.nii.ac.jp/ncid/BA55165218 Author Heading(s): United States. Federal Communications Commission

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