Study guide and reference material for commercial radio operator examinations. - United States. Federal Communications Commission (Washington : U.S. G.P.O. : For sale by the Supt. of Docs., U.S. G.P.O., 1955)
At head of title: Federal Communications Commission.
Mode of access: Internet.
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Keywords: Radio operators; Radio; Radio operators -- United States; Radio -- Examinations, questions, etc; United States; Examinations