Artificial Christmas tree (English Wikipedia)

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Neer, Katherine. "How Christmas Trees Work Archived 2008-12-24 at the Wayback Machine", howstuffworks.com, December 2006, accessed December 15, 2008.
"Glass Christmas Tree Archived 2008-12-27 at the Wayback Machine", Diablo Glass School, one-day course listing, accessed December 16, 2008.
Palmer, J. B. (2008, December 3). Choices Abound for PVC Christmas Trees This Season. Retrieved from Vinyl News Service: "Tree Choices". Archived from the original on 2013-12-13. Retrieved 2013-12-13.
Muñoz, Sara, Schaefer. "Fight Before Christmas: Real Trees vs. Fakes Archived 2016-01-21 at the Wayback Machine," The Wall Street Journal, December 21, 2006, accessed December 14, 2008.
"Pining Fir the Holidays Archived 2009-01-13 at the Wayback Machine", Warsaw Voice, December 19, 2002, accessed March 29, 2009.
Hayes, Sharon Caskey. "Grower says real Christmas trees are better for environment than artificial ones Archived 2010-06-27 at the Wayback Machine", Kingsport Times-News (Kingsport, Tennessee), November 26, 2008, accessed December 14, 2008.
"Facts on PVC Used in Artificial Christmas Trees Archived 2008-12-29 at the Wayback Machine", American Christmas Tree Association, official site, accessed December 15, 2008.
"Artificial Christmas Trees Not Eco-Friendly Archived 2011-07-19 at the Wayback Machine", Kansas State University: Research and Extension News, December 5, 2008, accessed December 15, 2008.
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wsj.com

Muñoz, Sara, Schaefer. "Fight Before Christmas: Real Trees vs. Fakes Archived 2016-01-21 at the Wayback Machine," The Wall Street Journal, December 21, 2006, accessed December 14, 2008.