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TRANSPORT FOR THE SPACE ECONOMY — A GEOGRAPHICAL STUDY, by Alan M. Hay, University of Washington Press, Seattle, Washington, 1973.
DIE ÖKONOMISCHE BEURTEILUNG DER STÄDTISCHEN UMWELTBELASTUNG DURCH AUTOMOBILABGASE — METHODEN UND QUANTIFIZIERUNGSVERSUCHE. (THE ECONOMIC ASSESSMENT OF THE ENVIRONMENTAL IMPACT OF MOTOR VEHICLE EMISSIONS IN URBAN AREAS — PROBLEMS OF METHODOLOGY AND QUANTIFICATION), by Ernst‐Slbrecht Marburger, Report No. 30, Institute of Transport Research Cologne University, Cologne, 1974, 339 pp.