| Figure 3. | Percentage of persons 25 years old and over, by highest level of educational attainment: Selected years, 1940 through 2008 |
| SOURCE: U.S. Department of Commerce, Census Bureau, U.S. Census of Population, 1960, Volume 1, Part 1; Current Population Reports, Series P-20; Current Population Survey (CPS), March 1961 through March 2008; and 1960 Census Monograph, Education of the American Population, by John K. Folger and Charles B. Nam. |
