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Potomac River Basin: Geographic History by Horatio N. Parker, Bailey Willis, R.H. Bolster W.W. Ashe, and M.C. Marsh. [U.S. Geological Survey Water Supply Paper No. 192. Series H, Forestry, 14. Series L, Quality of Water, 18. Series M, General Hydrographic Investigations, 20.].
出版1907
URLhttp://books.google.com.hk/books?id=FuG3wgEACAAJ&hl=&source=gbs_api