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Gaylord Nelson - Wikipedia
Gaylord Nelson Promotes the First Earth Day - U.S. Senate
Obituary: Gaylord Nelson, politician who started Earth Day
Gaylord Nelson | Saving Earth | Encyclopedia Britannica
Nelson, Gaylord, 1916-2005 | Wisconsin Historical Society
What to know about Earth Day and how it came to be | AP News
Gaylord A. Nelson, Founder of Earth Day, Is Dead at 89