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Acknowledgments
We thank L. Bevier, C. Bush, A. Poole, J. V. Remsen, K. Russell, and R. M. Zink for helpful comments and editorial assistance on the manuscript. Unpublished breeding-bird atlas data was provided for Yukon by Pam Sinclair, Canadian Wildlife Service Whitehorse, and for Nevada by Elizabeth Ammon and Ted Floyd, Great Basin Bird Observatory. We thank J. Klicka for sharing unpublished phylogenetic data. Bernd Freymann helped us by translating Schmid 1979 . DEK thanks Leonard Peyton and the Library of Natural Sounds and Lang Elliott for permission to use songs from their CD productions.
Weckstein, Jason D., Donald E. Kroodsma and Robert C. Faucett. 2002. Fox Sparrow (Passerella iliaca), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/715
