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Protocol for the Protection of Cultural Property in the Event of Armed Conflict. The Hague, 14 May 1954.
I - Para. 3.
3. Each High Contracting Party undertakes to return, at the close of hostilities, to the competent authorities of the territory previously occupied, cultural property which is in its territory, if such property has been exported in contravention of the principle laid down in the first paragraph. Such property shall never be retained as war reparations.