A Field and Finding Guide to Dragonflies of North America.
This book helps to identify the 300-plus species of dragonflies found in the United States and Canada.
And for a closer look at dragonflies...
If your interest in dragonflies is serious, you might want to get some nice binoculars. Like a Vortex Diamondback.
It has good optical quality. Its unusually wide field of view makes it easy to keep a darting dragonfly in sight. And because it focuses as close as 4-1/2 feet, you can study the details up close.
It's waterproof and has a lifetime guarantee. It comes in several sizes, but our favorite is the 8x42 model.