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Our online database contains a wide variety of airline brochures and route maps dating back to the 1920s. Check out our collection on our online database: http://bit.ly/2dcfV9R Image: United Air Lines route map, system map, 1970.SFO Museum Collection. Gift of David A. Abercrombie, in memory of Stanley A. Abercrombie. 2001.039.296 This image was posted on November 18, 2018.