E:
Earth’s Water Cycle in a Changing Climate - Webcast of a presentation at the Library of Congress by Peter Hildebrand, chief of the Hydrospheric and Biospheric Sciences Laboratory at NASA Goddard Space Flight Center. [U.S. Library of Congress (LOC), Science, Technology and Business Division]

N:
National Wetlands Inventory Center (NWI) - Generates information about the characteristics, extent and status of the Nation's wetlands and deepwater habitats [U.S. Department of the Interior (DOI), U.S. Fish and Wildlife Service]

National Wetlands Research Center, Lafayette, Louisiana - Homepage with links to general information, staff, issues and capabilities, library, publications and data [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS)]

Nonindigenous Aquatic Species Database - A central repository for spatially referenced biogeographic accounts of introduced aquatic species. [U.S. Department of the Interior (DOI), U.S. Geological Survey (USGS), Southeast Ecological Science Center]

O:
Observing the Living Oceans from Space. Webcast - A Webcast of a presentation by Gene Feldman, NASA Goddard Space Flight Center. [U.S. Library of Congress (LOC)]