PLATE No. 214 PER CENT ILLITERATE IN POPULATION 10 YEARS OF AGE AND OVER, BY STATES: 1920. ALL CLASSES. [District of Columbia, 2.8 per cent, not shown separately on the map.) 2. PER CENT ILLITERATE IN POPULATION 10 YEARS OF AGE AND OVER, BY STATES: 1910. ALL CLASSES. [District of ( 'olumbia, 4.9…
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