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31
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32كتاب
المساهمون: United Nations. Economic Commission for Europe. Committee on Water Problems.
مصطلحات موضوعية: Water-supply -- European Economic Community countries.
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33كتاب
مصطلحات موضوعية: Water resources development -- Developing countries -- Congresses., Water-supply -- Developing countries -- Congresses., Conference proceedings.
Relation: United Nations Water Conference, Mar del Plata, Argentine Republic, 1977.
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34كتاب
المساهمون: United Nations. Department of International Economic and Social Affairs., United Nations. Office for Programme Planning and Co-ordination.
مصطلحات موضوعية: United Nations -- Catalogs., Water resources development -- Bibliography -- Catalogs., Water-supply -- Bibliography -- Catalogs., Water -- Law and legislation -- Bibliography -- Catalogs., Water quality -- Bibliography -- Catalogs., Conservation of natural resources -- Bibliography -- Catalogs., Bibliography -- Catalogs., Catalogs.
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35كتاب
المساهمون: United Nations. Economic Commission for Europe. Committee on Water Problems.
مصطلحات موضوعية: United Nations. Economic Commission for Europe. Committee on Water Problems., Water resources development -- Europe., Water use -- Europe., Water-supply -- Europe.