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  • The falls of Niagara and their retrograde movement / 

    Desor, E. (Edouard), 1811-1882.; Pottsville Scientific Association (Pottsville, Pa.). Bulletin of the Pottsville Scientific Association, Schuylkill County, Penna. ([Pottsville, Pa. : Pottsville Scientific Association,, 2009-08-11)