Proceedings and documentation of the symposium organized by the United Nations Economic Commission for Europe and held from 2 to 15 May 1971 in Prague (Czechoslavakia) with a stdy tour to the region of Ostrava (Czechoslovakia) and Katowice (Poland). - ECE Symposium on Problems Relating to Environment, Prague, 1971; United Nations. Economic Commission for Europe (New York United Nations, 1971)
Keywords: Environmental engineering -- Congresses; Environmental policy -- Congresses