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    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...

    Argitaratua 1971
    Liburua

    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).

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