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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #III. Prisoners of war #A. Rules for captivity - Art. 72.
Art. 72. In case of their being authorized to engage in private industries, their pay for such services may be collected by the authority in charge of them. The sums so received may be employed in bettering their condition, or may be paid to them on their release, subject to deduction, if that course be deemed expedient, of the expense of their maintenance.