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TJ,
Good luck on your test man. If I remember correctly, study your tree biology pretty hard. Leaf shapes, cambium, xylem, phloem...you know, that ol' chestnut.
Next time I see a study guide on TreeBay I'm getting it. I loaned mine to an employee. He never came back. Neither did the study guide.
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Treestuff.com has the ISA study exam book for sale at $89.95 and for another $10 you can get the combo of the book and audio cd.