92. Swartzenruber, B. A. and H. M. Beck. 2001. A comparison of counts of migrating Red-tailed Hawks seen at Hawk Mountain Sanctuary and Bake Oven Knob, Pennsylvania, 1961-2000. American Hawkwatcher 27:11-17.
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92. Swartzenruber, B. A. and H. M. Beck. 2001. A comparison of counts of migrating Red-tailed Hawks seen at Hawk Mountain Sanctuary and Bake Oven Knob, Pennsylvania, 1961-2000. American Hawkwatcher 27:11-17.
Download