Come on! Buy more Liberty bonds. [copy 1].Whitehead, WalterVisual material1918Philadelphia : [s.n.], 1918.Ephemera—20th centuryPrinted ephemera—United States—20th century—SpecimensWar posters, American—20th century—SpecimensWorld War, 1914-1918—Economic aspects—United States—PostersUnited States. Army—History—World War, 19141918—PostersLiberty bonds—United States—PostersVisual material