614.7
U58E
               ECE symposium on problem relating to environment proceedings and documentation of the symposium - New York : Economic Commission for Europe, 1971.
               vii, 386p.
                Organised by United Nations Economic Commission for Europe and held from 2 to 15 May, 1971 in Prague (Czechoslovakia)with a study to us to the region of Ostrava (Czechoslovakia)and Katowice (Poland)

79020
                Subjects: Ecology; United Nations-Economic conditions; Czechoslovakia-Economic conditions.