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Convention (IV) relative to the Protection of Civilian Persons in Time of War. Geneva, 12 August 1949.
Internees shall be allowed to send and receive letters and cards. If the Detaining power deems it necessary to limit the number of letters and cards sent by each internee, the said number shall not be less than two letters and four cards monthly; these shall be drawn up so as to conform as closely as possible to the models annexed to the present Convention. If limitations must be placed on the correspondence addressed to internees, they may be ordered only by the Power to which such internees owe allegiance, possibly at the request of the Detaining Power. Such letters and cards must be conveyed with reasonable despatch; they may not be delayed or retained for disciplinary reasons.
Internees who have been a long time without news, or who find it impossible to receive news from their relatives, or to give them news by the ordinary postal route, as well as those who are at a considerable distance from their homes, shall be allowed to send telegrams, the charges being paid by them in the currency at their disposal. They shall likewise benefit by this provision in cases which are recognized to be urgent.
As a rule, internees' mail shall be written in their own language. The Parties to the conflict may authorize correspondence in other languages.