Reddit reviews Trees of North America: A Guide to Field Identification, Revised and Updated (Golden Field Guide from St. Martin's Press)
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There are these things that you can learn about trees which are actually made out of other trees who died and gave the remains of their bodies so that others may learn about the ways of their kind.
We call them: BOOKS
I suggest one that asks you a series of questions that eventually help you identify the exact tree such as this one http://www.amazon.com/Trees-North-America-Identification-Revised/dp/1582380929/ref=sr_1_1?ie=UTF8&qid=1452959128&sr=8-1&keywords=North+america+tree+identification
Trees of North America: A Guide to Field Identification, Revised and Updated (Golden Field Guide from St. Martin's Press) https://www.amazon.com/dp/1582380929/ref=cm_sw_r_cp_api_i_84JHDbYKHFARX
Short of a dendrology class.
http://www.amazon.ca/Trees-North-America-Identification-Revised/dp/1582380929
i have one of these from ~1975. obviously this has way more trees than just sk, but it's a great little book, one page per tree