References: The Physical Geography of North America

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Fenneman , N. M. 1931 . Physiography of Eastern United States , New York : McGraw-Hill .
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Fenneman , N. M. 1948 . Physiography of Western United States , New York : McGraw-Hill .
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Hunt , C . 1974 . Natural regions of the United States and Canada , San Francisco : W. H. Freeman and Company .
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Omernik , J. M. 1987 . Ecoregions of the conterminous United States . Annals of the Association of American Geographers , 77 : 118 – 25 .
Web of Science ®Google Scholar

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