50. Atkinson, E. C., L. J. Goodrich, and K. L. Bildstein. 1996. A temporal field guide to autumn raptor migration at Hawk Mountain Sanctuary, Pennsylvania. Pennsylvania Birds 10:134-137. | Hawk Mountain Sanctuary: Learn Visit Join

50. Atkinson, E. C., L. J. Goodrich, and K. L. Bildstein. 1996. A temporal field guide to autumn raptor migration at Hawk Mountain Sanctuary, Pennsylvania. Pennsylvania Birds 10:134-137.

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