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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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Waldo S. Glock. Available Relief as a Factor of Control in the Profile of a Land Form. The Journal of Geology, Vol. 40, No. 1 (Jan. - Feb., 1932), pp. 74- ...

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10Â¥2013-03-18 17:49:41
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ÏÈÖª: ½ð±Ò+10, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, лл£¡ 2013-03-18 01:12:02
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.

http://pan.baidu.com/share/link?shareid=506282&uk=573188901
3Â¥2013-03-17 22:23:34
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Guy-Harold Smith. The Relative Relief of Ohio. Geographical Review, Vol. 25, No. 2 (Apr., 1935), pp. 272-284.

http://pan.baidu.com/share/link?shareid=506284&uk=573188901
4Â¥2013-03-17 22:24:21
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