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According to an old article in the NY Times (April 2, 1946, p12) this is a copy of an official captured German map found by Allied intelligence officers sometime after WWII. It shows a bulls-eye target in the middle part of lower Manhattan. The concentric circles show concentrations of destruction from multiple V-2 type rockets or special orbital bombers.
Elsewhere the map is topped with the normal curve modeling the east-west error distribution of these multiple attacks.