The industrial heritage: what policies? : international colloquy held jointly by the Council of Europe and the French section of ICOMOS with the assistance of the French Ministry of Culture and Ministry for Urban Development, Housing and Transport and the Ecole nationale des ingénieurs des travaux publics de l'Etat, Lyons, Vaulx-en-Velin, 22-25 October 1985 (Architectural heritage reports and studies ;, 1987)