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Convention (I) for the Amelioration of the Condition of the Wounded and Sick in Armed Forces in the Field. Geneva, 12 August 1949.
Annex I : Draft agreement relating to hospital zones and localities - Prohibited work
No persons residing, in whatever capacity, in a hospital zone shall perform any work, either within or without the zone, directly connected with military operations or the production of war material.
Commentary of 1952