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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #II. Occupied territory #C. Rules of conduct with regard to property #(b) Private property - Art. 60.
Art. 60. Requisitioned articles, when they are not paid for in cash, and war contributions are evidenced by receipts. Measures should be taken to assure the ' bona fide ' character and regularity of these receipts.