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- Binder, Libuse. "The Earth Day Evolution." Earth911. March 15, 2008.http://earth911.com/blog/2008/03/15/the-earth-day-evolution/
- Lewis, Jack. "The Spirit of the First Earth Day." EPA. January/February 1990.http://www.epa.gov/history/topics/earthday/01.htm
- Van Fleet, Toby. "The Evolution of Earth Day." Portland Tribune. April 15, 2008.http://www.portlandtribune.com/sustainable/story.php?story_id=120793668830193400