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1900 01 OZ 03 04- 05 06 en 08 09 10 II IZ 13 14- 15 16 17 18 



YEAR 



Fig. 63. — Trend of death rates from four causes of death upon which no direct attempt at 

 control has been made. 



outstanding fact is that their rates of mortality have de- 

 clined and are declining just as did those in the control- 

 lable group shown in Figure 52. It is of no moment 



