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Conference on highway engineering and highway transport education (Regional) (1921, July 27 : University of Maryland): Proceedings of a conference on the economics of highway transport called by the Highway and highway transport education committee held at the University of Maryland, College Park, July 27, 1921 (The Highway and highway transport education committee, 1922), also by Charles Joseph Tilden and Highway Education Board (page images at HathiTrust)
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