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Show 1 7 ATTACK WARNING effects are graphically illustrated to the two aerial views of New York's George Washington Bridge above. The left picture shows normal mid-afternoon traffic, while the right 1 photo shows the same scene a few minutes later on July 20, 1956, after civil defense sirens had blown to test New York's ability to take cover quickly. In general, a large city populace would be told to take cover from impending attack only when there was too little warning time to evacuate. (New York Dally News Photos) |