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  • O'Connor, R. J., and R. B. Boone. 1992.  A Retrospective Study of Agricultural Bird Populations in North America. Pages 1165-1184 in Ecological Indicators, Volume 2. Edited by D. M. McKenzie, D. E. Hyatt, and V. J. McDonald. Cambridge University Press, Cambridge.
  • Olson, B.E. 2011. The Biogeography of Marbled Godwit (Limosa fedoa) Populations in North America. M.Sc. thesis, Utah State University, Logan, Utah, U.S.A.
  • Ortega, C., and G. E. Hill. 2010. Black-headed Grosbeak (Pheucticus melanocephalus). The Birds of North America. Edited by A. F. Poole. Retrieved from:
  • Oswald, J. A., M. G. Harvey, R. C. Remsen, D. U. Foxworth, S. W. Cardiff, D. L. Dittmann, L. C. Megna, M. D. Carling, and R. T. Brumfield. 2016. Willet Be One Species or Two? A Genomic View of the Evolutionary History of Tringa semipalmata. Auk 133:593-614.
  • Otis, D. L., J. H. Schulz, D. Miller, R. E. Mirarchi, and T. S. Baskett. 2008. Mourning Dove (Zenaida macroura). The Birds of North America. Edited by P. G. Rodewald. Retrieved from: https://
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