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- SpringerLink (Online service)703
- ebrary, Inc132
- Brook Lapping Productions122
- Infobase, film distributor92
- ProQuest (Firm)70
- Films for the Humanities & Sciences (Firm)67
- Infobase67
- Evans Woolfe (Firm)43
- Page, David P. (David Perkins), 1810-184843
- Comenius, Johann Amos, 1592-167042
- Project Muse41
- Association for Supervision and Curriculum Developement d/b/a ASCD (Firm)31
- Maverick Television (Television network)29
- American Chemical Society. Division of Chemical Education, sponsoring body28
- Brook Lapping Productions, production company28
- Lewin, Miriam28
- Bayley, John25
- McMurry, Charles A. (Charles Alexander), 1857-192925
- HighScope Press24
- Big Heart Media22