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- Pennsylvania. Dept. of Public Instruction10
- University of the State of New York10
- Sadler, Michael, Sir, 1861-19438
- United States. Congress. House. Committee on Education and Labor. Subcommittee on Elementary, Secondary, and Vocational Education8
- Bishop, John, 1941-7
- Brown, Elmer Ellsworth, 1861-19346
- Davis, Calvin Olin, 1871-6
- Hanus, Paul H. (Paul Henry), 1855-19416
- Barrow, William, 1754-18365
- Douglass, Harl R. (Harl Roy), 1892-19725
- Indiana. Dept. of Public Instruction5
- Johnston, Charles Hughes, 1877-19175
- Leach, Arthur Francis, 1851-19155
- United States. Congress. Senate. Committee on Health, Education, Labor, and Pensions5
- Congrès de l'enseignement secondaire4
- France4
- Great Britain. Board of Education4
- High School Principals' Conference (Indiana University)4
- Koos, Leonard V., 1881-19764
- Missouri. Dept. of Education4