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  1. How to Make Hydrogen Gas (4 Methods) - ThoughtCo

  2. 4 Ways to Make Hydrogen Gas at Home or in the Lab - Science …

  3. How to Make Hydrogen (Science Experiment): 10 Steps - wikiHow

  4. Hydrogen production - Wikipedia

  5. How to Make Hydrogen Gas : 17 Steps - Instructables

  6. Production of hydrogen - U.S. Energy Information Administration

  7. Preparation of Hydrogen - Science Info

  8. The Right Way to Make Hydrogen and Oxygen From Water

  9. Hydrogen Production Processes | Department of Energy

  10. How to Make Hydrogen : 6 Steps - Instructables