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Blozan, Will. "The Last of the Giants | American Forests." American Forests. American Forests, n.d. Web. 27 Sept. 2013. <http://www.americanforests.org/magazine/article/the-last-of-the-giants/>.

Bryan, Kathryn. "Natural Standard - Database Home." Natural Standard - Database Home. N.p., n.d. Web. 18 Sept. 2013.

Canham, Hugh. "Northern Woodlands." Northern Woodlands. Northern Woodlands, n.d. Web. 29 Sept. 2013. <http://northernwoodlands.org/articles/article/hemlock-and-hide-the-tanbark-industry-in-old-new-york>.

"Eastern Hemlock Forests: Guidelines to Minimize the Impacts of Hemlock Woolly Adelgid ." USA, Forest Service, May 2004. Web.

Farjon, Aljos. A Natural History of Conifers. Portland, Or.: Timber, 2008. Print.

Forest Health Technology Enterprise Team. "ImplementatIon and Status of BIological Control of the Hemlock Woolly AdelgId." USDA, Dec. 2011. Web.

Godman, RM, and Kenneth Lancaster. "Eastern Hemlock Forests: Guidelines to Minimize the Impacts of Hemlock Woolly Adelgid ." N.p., n.d. Web. 01 Oct. 2013. <http://www.amkennerdell.com/eh1.html>.

Lanncaster, Kenneth. "Tsuga Canadensis." Tsuga Canadensis (L. USDA, n.d. Web. 15 Sept. 2013.

Smith, William K., and Thomas M. Hinckley. Ecophysiology of Coniferous Forests. N.p.: Academic, 1995. Print.

"The St. Lawrence Lowlands." The St Lawrence Lowlands. Morgan Arboretum, n.d. Web. 18 Sept. 2013. <http://stlawrencelowlands.wordpress.com/2012/11/05/eastern-hemlock-tsuga-canadensis/>.

"Tsuga Canadensis." Tsuga Canadensis. University of Connecticut, n.d. Web. 14 Sept. 2013

VT Forest Biology Lab. "Vermont Invasive Forest Pest Update." Vermont Department of Forests and Pests, n.d. Web. 29 Sept. 2013.<http://www.vtfpr.org/protection/documents/hwaupdate2.pdf>.

Pictures: 

Britton and Brown. Tsuga Canadensis Drawing. 1913. Sketch. Illustrated Flora of the Northern States and Canada. Vol. 1: 62.

Del, Wilson. Peeling Hemlock Bark for Tanning. 1850. N.p.

Marlin, Bruce. Eastern Hemlock Specimens at Morton Arboretum. 2007. Photograph. N.p.

Montgomery, Michael. Adelges Tsugae. 2005. Photograph. Wikicommons, n.p.

Sdetwiler. Eastern Hemlock Underside. 2008. Photograph. WIkimedia Commons, n.p.

USDA. Tsuga Canadensis Distribution Map. 2009. Photograph. Wikicommons, n.p.

Wilhelm, Otto. Illustration Conium Maculatum. 1885. Sketch in book. Flora Von Deutschland, Österreich Und Der Schweiz, Gera, Germany.