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  1. The Keystone XL Pipeline: Everything You Need To Know - NRDC

  2. Keystone Pipeline - Wikipedia

  3. Keystone XL Pipeline: What it Means, How it Works - Investopedia

  4. Keystone XL pipeline: Why is it so disputed? - BBC News

  5. What Is the Keystone XL Pipeline — and Why Is It So …

  6. Everything you need to know about the Keystone XL pipeline

  7. A look at the history of the Keystone XL pipeline expansion

  8. Keystone XL Pipeline – Environmental and Energy Law Program