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U.S. Geological Survey Publications Warehouse92 ve.'bs 649 • 99/ GOO • 675. ! X 797 75 . 726 • 740 EXPLANATION Departure, in gammas, of vertical magnetic intensity from base

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Page 1: U.S. Geological Survey Publications Warehouse92 ve.'bs 649 • 99/ GOO • 675. ! X 797 75 . 726 • 740 EXPLANATION Departure, in gammas, of vertical magnetic intensity from base