18/09/1980 | Doc. 4596 | Committee Opinion Activities of OECD in 1979 in the environmental, road research and urban management fields 08/10/1979 | Doc. 4429 | Committee Opinion Activities of the OECD in 1978 in connection with the environment, road research and urban management 28/09/1978 | Doc. 4229 | Committee Opinion Reply to the report on the activities of OECD in 1977 - Environment, urban management and road research policy