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U. S. DEPARTMENT OF AGRICULTURE, 
BUREAU OF ENTOMOLOGY— CIRCULAR No. 121. 
L. O. HOWARD, Knlomologist and Chief of Bureau. 
THE OYSTER-SHELL SCALE AND 
Till] SCURFY SCALE. 
A. L. Quaintance, in GJiarge of Deciduous Fruit 
Insect Investigations, 
AM) 
E. K. Sasscer, S< n ntific Assistant. 
36826 Cir. 121—10 1 
WASHINGTON : GOVERNMENT PHINTING OFFICE : 1910 
