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[1] Guy-Harold Smith. The Relative Relief of Ohio. Geographical Review, Vol. 25, No. 2 (Apr., 1935), pp. 272-284.
[2] Douglas Johnson. Available Relief and Texture of Topography a Discussion.The Journal of Geology, Vol. 41,  No. 3 (Apr. - May, 1933), pp. 293-305.
[3] Preston E. James. On the Treatment of Surface Features in Regional Studies. Annals of the Association of American Geographers, Vol. 27, No. 4 (Dec., 1937), pp. 213-228.
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Guy-Harold Smith. The Relative Relief of Ohio. Geographical Review, Vol. 25, No. 2 (Apr., 1935), pp. 272-284.

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Preston E. James. On the Treatment of Surface Features in Regional Studies. Annals of the Association of American Geographers, Vol. 27, No. 4 (Dec., 1937), pp. 213-228.

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