Pocket Key of the Birds of the Northern United States, East of the Rocky Mountains (Paperback) (ISBN-13: 9781022690349)

If you're an amateur birdwatcher or just interested in learning more about the birds of North America, this guide is an essential resource. Apgar provides concise descriptions of hundreds of species, as well as tips for identifying them in the field. Small enough to fit in your pocket, this book is a must-have for any birdwatching expedition.

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