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Figure 20. — Surface water samples from off Blind Pass showing the number of red tide 

 organisms and copper concentrations per liter. The before and after 

 dusting points for the G. breve curve on September 2 9 show the swift 

 destruction of G. breve when the copper concentration rose. 



57 



INT.-DUP. SE^., WASH., D.C. i, e it 3 1 



