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Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter II : Contraband of war - Art. 23.
Art. 23. Articles exclusively used for war may be added to the list of absolute contraband by a declaration, which must be notified.
Such notification must be addressed to the Governments of other Powers, or to their representatives accredited to the Power making the declaration. A notification made after the outbreak of hostilities is addressed only to neutral Powers.