158. Farmer, C. J. and D. T. Hussell. 2008. The Raptor Population Index in practice. In The State of North America's birds of prey (K. L. Bildstein, J. Smith, and E. Ruelas, eds.). Series in Ornithology No. 3, Nuttall Ornithological Club and American Ornithologists' Union, Washington, D. C. | Hawk Mountain Sanctuary: Learn Visit Join

158. Farmer, C. J. and D. T. Hussell. 2008. The Raptor Population Index in practice. In The State of North America's birds of prey (K. L. Bildstein, J. Smith, and E. Ruelas, eds.). Series in Ornithology No. 3, Nuttall Ornithological Club and American Ornithologists' Union, Washington, D. C.

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