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UPPER. Drawing itself up to a height of 15 feet, the first wave pro- 

 duced by the underwater explosion pounds Bikini beach. Note the 

 height-of-water marker pole. LOWER. Backrush from the waves carried 

 50,000 tons of beach sand into the lagoon. Note erosion visible at 

 right, and the sand-filled boat. 



Plate 29 



