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1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
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. 71.
Art. 71. They may be employed on public works which have no direct connection with the operations in the theatre of war, which are not excessive and are not humiliating either to their military rank, if they belong to the army, or to their official or social position, if they do not form part thereof.