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  1. Columbia River - Wikipedia

  2. Columbia River | Location, Length, History, & Facts | Britannica

  3. Columbia River - WorldAtlas

  4. Columbia River - American Rivers

  5. Columbia River - The Oregon Encyclopedia

  6. Columbia River Basin

  7. Columbia River: Description, Creation, and Discovery

  8. Columbia River - Simple English Wikipedia, the free encyclopedia

  9. Columbia River summary | Britannica

  10. The Columbia River and Its Tributaries - USGS