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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 - Art. 6.
Hospital zones shall be marked by means of red crosses (red crescents, red lions and suns) on a white background placed on the outer precincts and on the buildings. They may be similarly marked at night by means of appropriate illumination.