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Draft Convention for the Protection of Civilian Populations Against New Engines of War. Amsterdam, 1938.
Bombardment of defended towns - Art. 5.
Art. 5. 1. Aerial bombardment is prohibited unless directed at combatant forces or belligerent establishments or lines of communication or transportation used for military purposes.
2. In cases where the objectives above specified are so situated that they cannot be bombarded without the indiscriminate bombardment of the civilian population, the aircraft must abstain from bombardment.