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  1. Spring (hydrology) - Wikipedia

  2. Springs and the Water Cycle | U.S. Geological Survey - USGS.gov

  3. What Is a Spring in Geography? - WorldAtlas

  4. Spring | Hydration, Health & Sustainability | Britannica

  5. Springs: Springs and the water cycle | U.S. Geological Survey - USGS.gov

  6. Spring water system classifications and their methods of study: An ...

  7. Types and classifications of springs - ScienceDirect

  8. Groundwater Hydrology of Springs - ScienceDirect

  9. Springs | SpringerLink

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