The best ones will be dedicated to your region of the country.
Get one with a dichotomous key for your area and learn to use it. They seem hard at first but read the 'How to use this manual' section and it will show you how to rule out most of the choices right off based on common, coincidental characteristics that have nothing to do with taxonomy. Saves a lot of time.
For general purpose I like 'The Sibley Guide to Trees' and 'Manual of Woody Landscape Plants' by Dirr. Dirr is good only if you have a good guess as to what the tree is to begin with but it ID's tons of cultivars and crosses that you won't find anywhere else.
No help with the books but I wanted to say hello and welcome you to the Treehouse.![]()
At some point, if you also might be wanting a book on the material that is in trees, I'd recommend Dr. Bruce Hoadley's, 'Understanding Wood'. Considered a definitive reference. Some application to tree work, and lots of pics....
No help with the books (I can't read, I just look at the pitchurs) but I wanted to say hello and welcome you to the Treehouse.![]()
Same here. Welcome, Jack!
So how's treework in Maryland? I think you're our first Marylander.