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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #II. Occupied territory #B. Rules of conduct with respect to persons - Art. 42.
' In consideration of the new relations which arise from the provisional change of government (Article 6
Art. 42. It is the duty of the occupying military authority to inform the inhabitants at the earliest practicable moment, of the powers that it exercises, as well as of the local extent of the occupation.