1. Maps. Exports. How American prosperity is dependent upon overseas trade, principal regions of production of leading American exports [map]; compiled by Shipping Board and Navy, with co-operation of Department of Commerce and Department of Agriculture. Scale 1° long.=0.5 in. n. p. Bookmark Corporate/Agency Authors: Shipping Board Publisher: Shipping Board Date: [1930] SuDoc number: SB 1.11:Ex 7