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Highway Research Board Bulletin, Issue 17, pp 12-14
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Highway Research Board Proceedings, Volume 26
Highway Research Board Proceedings, Volume 21
Highway Research Board Proceedings, Volume 20
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Rural Traffic Problems
Highway Research Board Proceedings, Volume 18
Highway Research Board Proceedings, Volume 17
Highway Research Board Roadside Development Committee Reports
Highway Research Board Proceedings, Volume 13
Highway Research Board Proceedings, Volume 12
Highway Research Board Proceedings, Volume 7
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