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  1. Spring (hydrology) - Wikipedia

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

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

  4. Types and classifications of springs - ScienceDirect

  5. Groundwater Hydrology of Springs - ScienceDirect

  6. Groundwater | Springs

  7. Springs regarded as hydraulic features and interpreted in the …

  8. Book review: Groundwater Hydrology of Springs: Engineering, …

  9. Springs | SpringerLink

  10. Spring | Hydration, Health & Sustainability | Britannica