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PERSISTENCE OF FAVORABLE SEAS «5, 8, 12 FT.) 



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PERSISTENCE OF UNFAVORABLE SEAS (^5, 8, 12 FT.l 



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APRIL, AAAY, JUNE 



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 DURATION (HOURS) 



PERSISTENCE OF FAVORABLE SEAS (<5, 8, 12 FT.) 



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PERSISTENCE OF UNFAVORABLE SEAS (g5, 8, 12 FT.) 



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FIGURE 7E KIEL 54°29.9'N., 10°18.0'E. 



64 



