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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter II : Contraband of war - Art. 29.
Art. 29. Likewise the following may not be treated as contraband of war:
(1) Articles serving exclusively to aid the sick and wounded. They can, however, in case of urgent military necessity and subject to the payment of compensation, be requisitioned, if their destination is that specified in Article 30
(2) Articles intended for the use of the vessel in which they are found, as well as those intended for the use of her crew and passengers during the voyage.