This map of the United States is divided into both time zones and radio districts. All radio stations are identified along with their corresponding call letters. A small inset at bottom left depicts the "American Radio Relay Divisions." Included with the map are 6 radio log pages and 26 pages of text listing all radio stations in the United States along with their ownership. Published by the Esco Electric Supply Company of Albany, New York as a promotional item. No examples located on OCLC or elsewhere, including the Newberry Library archive.

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Condition: B+

Issued folding with uniform light toning and a tiny hole confined to the top blank margin. Covers have minor wear.