Siti specifici sulle wetlands Environmental Laboratory Wetlands (USA) National Wetlands Research Center (USGS, USA) NWI - National Wetlands Inventory (USA) NWRC - National Wetlands Research Center (USGS, USA) Ramsar Convention (Swiss) Wetlands (EPA, USA) Wetlands and Climate Change (Canada) Wetlands and Water Resources Programme (IUCN, USA) Wetlands International WRAP - Wetlands Regulatory Assistance Program (USA)