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Manual on Uniform Traffic Control Devices for Streets and Highways
United States. National Advisory Committee on Uniform Traffic Control Devices
出版Department of Transportation, Federal Highway Administration, 1978
ISBN15605147369781560514732
URLhttp://books.google.com.hk/books?id=QxRRAQAAMAAJ&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN