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  1. 501(c)(3) organization - Wikipedia

  2. 501(c) organization - Wikipedia

  3. 501(c)(3) Organization: What It Is, Pros and Cons, Examples - Investopedia

  4. What Is a 501(c)(3) Organization? Types, Rules, and Pros & Cons ...

  5. What is a 501(c)(3)? A Guide to Nonprofit Tax-Exempt Status

  6. 501(c) Organization: What They Are, Types, and Examples - Investopedia

  7. 501(c)(3) Organizations: What Are They? - The Balance

  8. Wikimedia Foundation - Wikipedia

  9. Support Wikipedia – Wikimedia Foundation

  10. Exemption Requirements - 501(c)(3) Organizations - Internal …