A few comments
This is the companion volume to the western trees edition. Having been able to spend some time on the east coast for the first time since I was a boy, I found I could only identify a handful of species, so I bought this book to see what I could identify, being familiar mostly with the west coast.

The Audubon books main strengths are in combining excellent photos of the main parts of the tree, the flowers or cones, branches, and bark, to aid in identifying the tree. Curiously, the book doesn't include photos of the entire tree, but in the text section there are drawings next to the description. This is okay too, and an expert dendrologist can often simply ID a tree from its "stature type." With a little experience with the trees in your area, you'll soon be doing the same.

I've found the Audubon books on plant identification very helpful, but I have to say I have some formal training in botany, mainly in plant taxonomy, which is a big help. The only real sure way to ID a plant is by using the formal key, but in an area where the species are limited, which is usually the case with trees in temperate zones, a picture type book can often do the trick. Just be aware that there are many pitfalls in not using the actual botanical key. (If this were the Amazon rainforest, there can be 400 species of trees in a few acres, so this approach wouldn't work).

This book uses a leaf classification key mainly, and has 10 pages devoted to flowering plants and conifers at the beginning of the book to point to the the relevant section. From there you basically leaf through that section to ID the tree. For the flowering trees, color information is provided too.

The text descriptions are brief but well done, and includes information on range, ecology, height and diameter, size of cones, leaves, and flowers, color, and uses. Overall, it's another useful and informative guide from Audobon done in the style which many people are familiar with for naturalist use, or just your casual cursiosity seeker who wants to learn more about these important plants.

By the way, for some excellent and brief key books for the west coast, look for Glen Keator's little books, which are available at bookstores and also at the Strybing Auboretum in Golden Gate Park. Glen had a Ph.D. in taxonomic botany and was the trainer for the docents in the park, also, if I remember right, and I have fond memories of spending many hours hiking while using his books, which became an invaluable aid in my undergraduate and graduate botanical education.

Lot's of pictures
Lot's of pictures in the book. Not super user friendly, but still really good and informative.

Tree identification
Just what I was looking for, to help identify the trees on property we recently purchased. Now is great since the trees are leafing out, which will make the ID easier.

Superior tree guide
An oldie but a goodie. Too bad it's not discounted. We're on our second copy. There isn't anything out there that is as complete. Audubon rules.

A Useful Guide to Trees
This is a user-friendly guide to trees in the Eastern U.S.A. So far, I have found it to be an enjoyable item to put in my backpack for a day on the hiking trail or the park. The book is clearly organized, with sections for leaves, flowers/nuts, and a couple of other categories. It is a good size, and the illustrations are clear. This book will help you identify trees. However, it is not a textbook or a serious introduction to the study of trees - for that, you would need something else.