Kenn Kaufman is a living legend.  Kaufman guides are touted as "the easiest guides for fast identification".
Enter quantity:"The most user-friendly guide ever published."—Bill Thompson III, Bird Watcher’s DigestIn 2000 Houghton Mifflin first published the Kaufman Focus Guide to the Birds of North America. Critically acclaimed for its innovative design, the Kaufman guide began introducing a new generation to birding. In 2005, this new Kaufman Field Guide to Birds of North America is now the most up-to-date field guide, including dozens of changes by the American Ornithologists’ Union in official names of birds; the addition of new species to reflect the latest scientific discoveries; and dozens of updated range maps. Additional information helps beginning birdwatchers get started, all in the same compact format that has made this guide the easiest to use for fast identification in the field. ISBN 13:978-0-618-57423-0