01234nam a2200265Ia 450000100060000000300050000600500170001100800410002801000150006905000180008408200160010211100690011811100760018711100690026324502560033226000360058830000320062435000090065641000460066550000610071150400410077265000500081365000450086371000600090816640BIBL20160527184102.0720904s1971    nyua     b    10000 eng    a 72191103 0 aTD5b.E2 1971  a333.7/2/09420aECE Symposium on Problems Relating to EnvironmentcPragued1971.20aECE Symposium on Problems Relating to EnvironmentcPragued1971.2Local20aECE Symposium on Problems Relating to EnvironmentcPragued1971.10aProceedings and documentation of the symposium organized by the United Nations Economic Commission for Europe and held from 2 to 15 May 1971 in Prague (Czechoslovakia)bwith a study tour to the region of Ostrava (Czechoslovakia) and Katowice (Poland).0 aNew YorkbUnited Nationsc1971.  avii, 386 p.billus.c29 cm.  a6.5020a[United Nations.tDocument]vST/ECE/ENV/1  a"United Nations publication. Sales number: E.71.II.E.6."  aIncludes bibliographical references. 0aEnvironmental engineeringxCongresses.2Local 0aEnvironmental policyxCongresses.2Local20aUnited Nations.bEconomic Commission for Europe.2Local