Abstract
Leonard, A. B. and J. C. Frye. 1954. Ecological conditions accompanying less deposition in the Great Plains region of the United States. Jour. Geol. 62: 399. Schaffner, J. H. 1926. Observations on the grasslands of central United States. Ohio State Univ. Studies, Contr. Vol. 178: 1-56. Thornber, J. J. 1901. The prairie-grass formation in region I. Rep. Bot. Surv. Univ. Nebr. 5: 29-143. Thornthwaite, C. W. 1931. The climates of North America according to a new classification. Geographical Review 21: 633-655.
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