Resource: Professional Societies
- The Multicultural Media Correspondents Association
- The National Association of Underwater Instructors
- The National Environmental Law Center
- The National Society of Black Physicists
- The National Society of Hispanic Physicists
- The Nature Conservancy
- The Naval History and Heritage Command (NHHC) Underwater Archaeology Branch
- The Nuestra Tierra Conservation Project
- The Ocean Agency
- The Ocean Cleanup
- The Ocean Foundation
- The Ocean Outlaw Project
- The Oceanography Society
- The Planetary Society
- The Rebreather Association of International Divers
- The Representation Project
- The Royal Institution of Naval Architects
- The Royal Meteorological Society
- The Safina Center
- The Sargasso Sea Commission
- The Sea of Change Foundation
- The Society for Economic Botany
- The Society for Historical Archaeology
- The Society for Technical Communication
- The Society of American Travel Writers
- The Society of Authors
- The Society of Exploration Geophysicists
- The Society of Marine Mammalogy
- The Society of Marine Mammalogy
- The Society of Professional Journalists
- The Society of Women Engineers
- The State of the World's Sea Turtles
- The Travel Foundation
- The Waksman Institute of Microbiology
- The Wild Dolphin Project
- The World Federation for Coral Reef Conservation
- The Writer's Center
- The Writers and Publishers Network
- The Writers' Union of Canada
- The Zoological Society of London
- Toronto Botanical Garden
- Torrey Botanical Society
- Trans*H4ck
- Travelyst
- Treehugger
- Turtle Island Restoration Network
- Type Investigations
- U.S. Committee on the Marine Transportation System
- U.S. Energy Information Administration
- U.S. Environmental Protection Agency