Books by American Association of State Highway Officials. Committee on Traffic:
Books in the extended shelves:
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American Association of State Highway Officials. Committee on Traffic: National practices for the operation and protection of school zones and crossings; an informational report by Committee on Traffic, Subcommittee on Traffic Control Devices in cooperation with Colorado Department of Highways. (American Association of State Highway Officials, 1953), also by Colorado. Department of Highways (page images at HathiTrust)
Find more by American Association of State Highway Officials. Committee on Traffic at your library, or elsewhere.