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  1. Oil shale industry - Wikipedia

  2. Oil shale - Wikipedia

  3. Shale oil extraction - Wikipedia

  4. Oil Shale Processing - an overview | ScienceDirect Topics

  5. Status, disadvantages, and prospects of oil shale in China: An …

  6. Shale Oil - an overview | ScienceDirect Topics

  7. Oil Shale and Tar Sands - Bureau of Land Management

  8. Shale oil | Unconventional Oil, Fracking & Extraction | Britannica

  9. Advances and challenges in shale oil development: A critical

  10. Oil Shale - National Geographic Society