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  1. Wetlands and Estuaries | U.S. Geological Survey - USGS.gov

  2. What is an estuary? - NOAA's National Ocean Service

  3. About Coastal Wetlands | US EPA - U.S. Environmental ...

  4. What is a wetland? - NOAA's National Ocean Service

  5. Estuaries & Coastal Wetlands | National Wildlife Federation

  6. Estuary - Wikipedia

  7. Estuaries - NOAA's National Ocean Service