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Protocol for the Protection of Cultural Property in the Event of Armed Conflict. The Hague, 14 May 1954.
II - Para. 5.
5. Cultural property coming from the territory of a High Contracting Party and deposited by it in the territory of another High Contracting Party for the purpose of protecting such property against the dangers of an armed conflict, shall be returned by the latter, at the end of hostilities, to the competent authorities of the territory from which it came.