1999
Liverman, D. 1999. North American Landscape Characterization (NALC) Digital Elevation Model (DEM). University of Arizona, Latin American Area Center, Tucson, Arizona.
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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.
Spellenberg, R. 2007. E-mail to P. Tonne from Rich Spellenberg. 4 April 2007. 2 p.
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