82. Jacobson, M. A., and W. Potter. 1999. A comparison of Red-shouldered Hawk autumn migration counts at Hawk Mountain Sanctuary and Bake Oven Knob, Pennsylvania, 1982-1998. American Hawkwatcher 25: 11-16.
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82. Jacobson, M. A., and W. Potter. 1999. A comparison of Red-shouldered Hawk autumn migration counts at Hawk Mountain Sanctuary and Bake Oven Knob, Pennsylvania, 1982-1998. American Hawkwatcher 25: 11-16.
Download