A remarkable advertising pocket map published for the Morton Salt Co. and designed to assist in the location of radio (AM) stations across the United States and southern Canada. Contains an extensive list of nearly 1,000 radio stations with the call sign, frequency and location of each. The U.S. is divided into four "Radio Districts" that include southern Canada. With a large inset of North America with red overprinting. Folds into pictorial paper covers (4.5 x 7.5") noting the price of $.25 and "Revised to Oct. 16, 1926."

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Condition: A

Issued folding with one stain adjacent to the text at bottom, away from the map image. Paper wrappers have minor wear.