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Show Symbols of American Defense vV V """k Tractors and tanks symbolize modern American defense. Farim-i operating the machinery at top are carving out terraces which defem their soil from erosion. Soldiers operating the U. S. army tank m lowe. picture are practicing maneuvers which strengthen the nation's armet defense. American farmers, carrying on soil protection work undo the AAA Farm Program, last year built more than 67,000 miles o terraces, enough to reach more than two and a half times around t' world. |