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Transportation Research Board Conference Proceedings, Volume 3, Issue 1, p. 48-49
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NCHRP Research Results Digest, Issue 199, 5 p.
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NCHRP Research Results Digest, Issue 185, 3 p.
Proceedings of the 1990 Geographic Information Systems (GIS) for Transportation Symposium, 11p
TR News, Issue 142, p. 28-29
Highway Research Record, Issue 109, pp 59-67
Highway Research Board Special Report, Issue 82
Highway Research Board Special Report, Issue 82, pp 21-23
Highway Research Board Special Report, Issue 82, pp 25-27
Highway Research Board Proceedings, Volume 38
Highway Research Board Bulletin, Issue 199, 12p
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