Holly if your about to take the test then just focus on the study guide, looking at anything else will only distract you..... if you have say a few months yet then you could get a lot of use both for the test and in general from "Arboriculture: Integrated Management of Landscape Trees, Shrubs, and Vines", 4th edition. 2004. By Richard W Harris, James R. Clark, and Nelda P. Matheny. Much of the test and therefore the study guide comes from this text book..its a little outdated (or at least the edition I have is!) but its a very useful starting point.
Good luck in the test, remember if you miss one or two questions in a domain you can still get a pass, 70% is the cut off (I think).
__________________ Sean  Trees are poems that earth writes upon the sky,
We fell them down and turn them into paper,
That we may record our emptiness.
- Kahlil Gibran
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