Early 1970's fold out map 'Cross the Border by Auto-Tunnel, Detroit & Canada Tunnel Corporation. Map folds out to a large sized 22"x17" size. A large map of Detroit, Windsor, and surrounding area is on one side. The flip side has a very detailed long info article about the tunnel "The Tunnel Construction Story", border crossing tips, a mileage chart, and a small detailed map showing attractions in downtown Detroit near the tunnel. Very good condition.