Ecoregions of North America: After the Classification of J.M. Crowley
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Ecoregions of North America: After the Classification of J.M. Crowley, map, June 1981; Fort Collins, Colorado. (digital.library.unt.edu/ark:/67531/metadc100519/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.