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Transportation Research Record, Issue 619, pp 5-7
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Highway Research Circular, Issue 28
Highway Research Circular, Issue 18
Highway Research News, Issue 25, pp 57-62
Highway Research Board Bulletin, Issue 330, pp 40-51
Highway Research Board Bulletin, Issue 244, 10p
Highway Research Board Bulletin, Issue 255
Highway Research Board Proceedings, Volume 33
Highway Research Board Bulletin, Issue 17, pp 12-14
Highway Research Board Proceedings, Volume 21
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Rural Traffic Problems
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