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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.

Wildlife Habitat Council and USDA NRCS. 1999. Lesser prairie-chicken. Fish and Wildlife Habitat Management Leaflet Number 6. September 1999. 8 p. http://www.westgov.org/wga/initiatives/HighPlains/leaflet.htm.

Hamann, K. 1999. NMNHP plant/animal occurrence record contributor's forms with information on two rare plant species. 6 p.