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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #I. Hostilities #A. Rules of conduct with regard to individuals #(d) The dead - Art. 20.
Art. 20. The dead should never be buried until all articles on them which may serve to fix their identity, such as pocket-books, numbers, etc., shall have been collected.
The articles thus collected from the dead of the enemy are transmitted to its army or government.