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The Statistics of Communications Common Carriers (SOCC) has been published annually since 1939.  The SOCC is a widely used reference work in the field of telecommunications. It is the only permanent record of common carrier activity published by the Government Printing Office and sent to repository libraries.  The most recent edition may be purchased by mail from the Superintendent of Documents, Washington, DC  20202-9328, or by callingthe GPO's Order and Inquiry Desk at (202) 512-1800.