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Highway Research Abstracts, Volume 20, Issue 6, p. 17-27
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Highway Research Board Bulletin, Issue 28, 121p
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Highway Research Board Bulletin, Issue 28, pp 100-121
Highway Research Board Bulletin, Issue 28, pp 36-62
Highway Research Board Bulletin, Issue 28, pp 17-35
Highway Research Board Proceedings, Volume 29
Highway Research Board Roadside Development Committee Reports
Highway Research Board Bulletin, Issue 28, pp 2-16
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