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Current results range from 1973 to 2004
- Nitrogen -- Fixation -- Washington (State) -- Chester Morse Lake1
- Nitrogen -- Fixation -- Washington (State) -- Findley Lake1
- Nitrogen -- Fixation -- Washington (State) -- Sammamish, Lake1
- Nitrogen -- Fixation -- Washington (State) -- Washington, Lake1
- U.S. International Biological Program. Coniferous Forest Biome1