38 



BULLETIN" 813, U. S. DEPARTMENT OF AGRICULTURE. 





Si 



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so 



B.;i 



a.? 





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O 



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cr 



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O 

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85 



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o 



115 



w 



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8 



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ci 



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coco 0-* OIM 

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05 



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CO 



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i 



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CO 



CM OI> Ort O O 



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r-l .-1 .-1 ,-41-4 g 



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