wiscwhip
5 year old buck +
Publication by Cornell University. Looks like it was designed to be some type of course material for a basic high school forestry or ecology class. Simple but good information. Primarily geared for NY state, but a good resource anywhere these species are found.
http://www.uvstorm.org/Downloads/Know_Your_Trees_Booklet.pdf
http://www.uvstorm.org/Downloads/Know_Your_Trees_Booklet.pdf