Hawks from Every Angle: How to Identify Raptors In Flight
by Jerry Liguori,David A. Sibley
ISBN 13: 9780691118253
Format: Illustrated (144 pages) Publisher: Princeton University Press Published: 12 Sep 2005
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The Crossley ID Guide: Raptors (The Crossley ID Guides)
by Richard Crossley,Jerry Liguori,Brian L. Sullivan
ISBN 13: 9780691157405
Format: Illustrated (288 pages) Publisher: Princeton University Press Published: 07 Apr 2013