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• Arizona State University School of Life Sciences (20)

• Basal Alignment Project (112)
• BCcampus (46)
• betterlesson.com (22)
• Boston University (20)

• CK-12 Foundation (792)
• CLEAN: Climate Literacy and Energy Awareness Network (196)
• Code.org (341)

• Digital Public Library of America (150)

• EL Education (113)
• Encyclopedia of Life: Smithsonian (21)
• EngageNY (149)
• Eureka Math (Great Minds) (82)
• Exploratorium (149)

• GeoGebra (23)
• Georgia Virtual (1322)

• Illustrative Mathematics (1101)

• Johns Hopkins Bloomberg School of Public Health (11)
• J. Paul Getty Museum (41)

• Khan Academy (1125)
• KQED Education (75)

• Lumen Learning (36)

• MIOpenBook (13)
• MIT (30)
• M.I.T. (83)

• National Endowment for the Humanities (406)

• Ohio State University College of Education and Human Ecology (437)
• OpenOregon (10)
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• Science Education Resource Center (SERC) at Carleton College (1340)
• State University of New York (15)

• TeachEngineering (1582)
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• The Saylor Foundation (115)

• University of Colorado Boulder (198)
• University of North Carolina at Chapel Hill School of Education (47)
• University System of Georgia (13)
• U.S. Census Bureau (62)

• Virginia Museum of Fine Arts (VMFA) (18)
• Virginia Public Media (VPM) (17)

• Wikibooks (65)
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