International transportation topics : 4 reports ; sign uniformity, closing the Darien gap, transportation in Europe, and transportation in Great Britain ; [paper[s] ... presented at the 48th annual meeting, Highway Research Board]
Annual meeting. Highway Research Board ; 48 ; 1969 ; Washington, DC Annual meeting. Highway Research Board ; 48 (Washington, DC) : 1969.
1969
50 S.
Ill.
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