a o 



COLUMBIA RIVER 



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_P3 



" GULF " 



1 | 2 3^ ' 4 5 ' 6 



AGGLUTINATION SCORE WITH SERUM WP 4 



Figure 1. — Histograms showing the agglutination strengths of sockeye 

 salmon erythrocyte samples from three populations. 



INT.-DUP. SEC., HASH.. D.C. u mB2 



