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- ebrary, Inc159
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- Mathematical Association of America26
- Andreescu, Titu, 1956-25
- Easy Education, production company23
- Le, Tao18
- Institute of Leadership & Management (Great Britain)16
- Gibson, Jason (Math instructor)15
- TMW Media Group, production company15
- Illinois Eastern Community Colleges. Coal Mining Technology12
- National Institute for Trial Advocacy (U.S.)12
- Spiegel, Murray R.12
- Oxford University Press11
- Pardey, David11
- Pólya, George, 1887-198511
- Teachers TV (Television Channel)11