42 BULLETIN 965, U. S. DEPARTMENT OF AGRICULTURE. 
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ERCNSOURRE 
REPRESENTS 
/ORCRES OF CITRUS. 
/9A/TCOA/TPOL 
/MW6£//fflE0 M/9/Z 
RNT COA/TRVL 
% M/7UGURRTED ] IN 1913. 
RNT CONTROL 
/NR060RRTED IN 19/9. 
DEMONSTRRT/ON-RLOTS. 
YE/?R> 
/9/7 
/9/a 
/9/9 
7VT/9L 
NE/V/PRER UNDER CONTROL 
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3eo 
/to 
630 
COMPLETE RNT ERRD/CRT/O/V 
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300 
4SO 
E/VT/RE /PRE/? UNDER CONTROL (N /9£Q> 
Fig. 21.— Diagram of the area under Argentine ant control at Upland, Calif., 1917-1919. 
