120 Years of American Education: A Statistical Portrait.
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[1] R. Lykes. Higher education and the United States Office of Education, 1867-1953 , 1977 .
[2] J. Folger,et al. Education of the American Population , 1975 .
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[1] R. Lykes. Higher education and the United States Office of Education, 1867-1953 , 1977 .
[2] J. Folger,et al. Education of the American Population , 1975 .