Garden Insects of North America: The Ultimate Guide to Backyard Bugs by Whitney Cranshaw
Wonderful insect resource which has tons of zoomed in color photos, which aid in identification of insects. The book is organized by how the insects impact your garden. For example, the chapters are: Leaf Chewers; Leafminers; Flower, Fruit, and Seed Feeders; Sap Suckers; Gall Makers; Stem and Twig damagers; Trunk and Branch Borers; Root, Tuber, and Bulb Feeders; Beneficial Garden Arthropods.
The book’s focus is not so much about insect control or prevention, but insect identification.