A special thanks to the sources that made this page possible:

Barnes, B.V. and Wagner, W.H. 1981. Michigan Trees: A guide to the trees of
         Michigan and the Great Lakes. The University of Michigan.              

Earle, C.J. 2008. Pinus Strobus. The Gymnosperm Database, available from
         "http://conifers.org/pi/pin/strobus.htm." Accessed 12 Apr 2010.

Hasbrouk, J. and Mirov, N.T. 1976. The Story of the Pines. Indiana University Press.  

Michаel F. "Pinus strobus L.". Encyclopedia of Life, available from
        "http://www.eol.org/pages/1061748". Accessed 10 Apr 2010.

Mirov, N.T. 1967. The Genus Pinus. The Ronald Press Company.  

Moran, M. Study of Northern Virginia Ecology, available from
          Accessed 13 Apr 2010.

Richardson, D.M. 1998. Ecology and Biogeography of Pinus. Cambridge University

Walker, L.C. 1999. The North American Forests: Geography, ecology, and
         silviculture. CRC Press.

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