BNSF Railway
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S. D. Bechtel, Jr. Foundation
Carnegie Corporation of New York
Bill & Melinda Gates Foundation
Gruber Family Foundation
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Howard Hughes Medical Institute
Robert Wood Johnson Foundation
Joyce Foundation
John S. and James L. Knight Foundation
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National Endowment for the Arts
National Science Foundation
John and Wendy Neu Family Foundation
David and Lucile Packard Foundation
Park Foundation
Poetry Foundation
Rockefeller Foundation
Skoll Foundation
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Starr Foundation
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