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 - ECE Symposium on Problems Relating to Environment (1971 : Prague); United Nations. Economic Commission for Europe (New York United Nations, 1971)
'United Nations publication. Sales number: E.71.II.E.6.'
Includes bibliographical references.
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Keywords: Environmental engineering -- Congresses; Environmental policy -- Congresses