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Convention relative to the Treatment of Prisoners of War. Geneva, 27 July 1929.
Part III : Captivity #Section II : Prisoners of war camps #Chapter 3 : Hygiene in camps - Art. 13.
Art. 13. Belligerents shall be required to take all necessary hygienic measures to ensure the cleanliness and salubrity of camps and to prevent epidemics.
Prisoners of war shall have for their use, day and night, conveniences which conform to the rules of hygiene and are maintained in a constant state of cleanliness.
In addition and without prejudice to the provision as far as possible of baths and shower-baths in the camps, the prisoners shall be provided with a sufficient quantity of water for their bodily cleanliness.
They shall have facilities for engaging in physical exercises and obtaining the benefit of being out of doors.