References
- Blasing, T. J., and P. N. Puvik, 1983, Filtering the effects of competition on tree ring width series. Tree-Ring Bulletin 43: 19-30.
- Illinois Secretary of State 2013, http://landplats.ilsos.net
- Pederson, Neil, 2010, External characteristics of old trees in the Eastern Deciduous Forest. Natural Areas Journal 30(4):396-407.
- University of Illinois Extension, 2013, http://www.extension.org/pages/33763/tree-growth
- USDA Forest Service 2005 Forest Health, http://www.fs.fed.us/outernet/r6/nr/fid/health/2005highlights-or.shtml
- Williams, P., 2013, Introduction to Tree-Ring Research: A 2-week laboratory module, http://www.geog.ucsb.edu/~williams/geog167lab/treeringresearchlab.pdf Data for the Torrey Pine graph in Williams from Biondi, F., D.R. Cayan and W.H. Berger, 1997, Dendroclimatology of Torrey pine (Pinus torreyana Parry ex Carr.). The American Midland Naturalist 138: 237–251..