00719nam a2200133Ia 4500008004100000040001700041082002200058110005100080245010100131260005100232300001500283500020300298650008400501190327s9999||||xx |||||||||||||| ||und||  aNITILcNITIL  221sta614.7bU58E  aUnited Nations. Economic Commission for Europe 0aECE symposium on problem relating to environmentbproceedings and documentation of the symposium  aNew YorkbEconomic Commission for Europec1971  avii, 386p.  aOrganised 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)  aEcology; United Nations-Economic conditions; Czechoslovakia-Economic conditions