URL: https://digitalcollections.hoover.org/objects/37511 Collection Structure Poster collection > Our three lines of national defense. The smoke of America's factory stacks is a signal of our workers' and employers' loyalty. It means more guns, more ships, more food. Our industries are the third and main supporting line of defense - our base of supplies. Without them the Army and Navy would be helpless. As good patriots let us strive to keep our industries strong. Item Title Our three lines of national defense. The smoke of America's factory stacks is a signal of our workers' and employers' loyalty. It means more guns, more ships, more food. Our industries are the third and main supporting line of defense - our base of supplies. Without them the Army and Navy would be helpless. As good patriots let us strive to keep our industries strong. Collection Title Poster collection Artist Peckner, A. Issuing Body National Association of Manufacturers (U.S.) Date Created 1917/1918? Description Drawing of troops, ships, and factories. Subject(s) Industrial productivity Manpower Priorities, Industrial Economic aspects World War, 1914-1918 Supplies and stores United States Social aspects Efficiency, Industrial Language(s) English Country of Origin United States Country of Origin United States Dimensions Overall: 25 x 19 in. (63.5 x 48.3 cm) Format Poster Medium political posters Color color Color color Hoover ID Poster US 4292 Record Number XX343.27887 Collection Guide https://oac.cdlib.org/findaid/ark:/13030/kt829015km Rights No known restrictions.