Reddit reviews A Field Guide to Bird Songs: Eastern and Central North America (Peterson Field Guides)
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Still available, on CD: http://www.amazon.com/dp/0618225943
And the other side of North America: http://www.amazon.com/dp/0395975190
iOS app: https://itunes.apple.com/us/app/peterson-backyard-birds-field/id431948401?mt=8