This is the fourth edition of Armour's food source map of the United States that was used as a promotional mailer, touting "the greatness of the United States is founded on Agriculture." The colorful map is filled with small illustrations showing the variety of agricultural products harvested across the country. Includes a key at right identifying 32 different products with cattle, hogs and sheep listed first along with a listing of Armour plants around the country. The verso contains a "History of the American Food Industry" with numerous photographic illustrations. Self-folding. Drawn by Lehnhardt.

References: Rumsey #9013; PJ Mode Collection #2081; cf. Hornsby (Picturing America) p. 7.

Condition: A

Issued folding on a clean sheet with a few tiny splits at fold intersections.