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Pruss, S. D. 1999. Selection of natal dens by the swift fox (Vulpes velox) on the Canadian prairies. Canadian Journal of Zoology 77:646-652.

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Liverman, D. 1999. North American Landscape Characterization (NALC) Digital Elevation Model (DEM). University of Arizona, Latin American Area Center, Tucson, Arizona.

Harvey, M.J., J.S. Altenbach, and T.L. Best. 1999. Bats of the United States. Arkansas Game and Fish Commission. 64 p.