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Convention (II) with Respect to the Laws and Customs of War on Land and its annex: Regulations concerning the Laws and Customs of War on Land. The Hague, 29 July 1899.
Art. 4. Non-Signatory Powers are allowed to adhere to the present Convention.
For this purpose they must make their adhesion known to the Contracting Powers by means of a written notification, addressed to the Netherlands Government, and by it communicated to all the other Contracting Powers.