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Convention (V) respecting the Rights and Duties of Neutral Powers and Persons in Case of War on Land. The Hague, 18 October 1907.
Chapter V : Final provisions - Art. 22.
Art. 22. Non-Signatory Powers may adhere to the present Convention.
The Power which desires to adhere notifies its intention in writing to the Netherlands Government, forwarding to it the act of adhesion, which shall be deposited in the archives of the said Government.
This Government shall immediately forward to all the other Powers a duly certified copy of the notification as well as of the act of adhesion, mentioning the date on which it received the notification.