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Draft Convention for the Protection of Civilian Populations Against New Engines of War. Amsterdam, 1938.
Safety zones - Art. 14.
Art. 14. Such safety zones must be circular in shape and clearly indicated by marks visible by day to aircraft, and the nature of such marks shall be set out in the notification to other Powers as provided in the last-mentioned Article
. The marks used for its safety zones by a State must all be of the same size, colour and pattern. The distinctive flag of the Geneva Convention shall not be used as a mark for such safety zones, nor shall the national flag of any State be so used.