The falls of Niagara : their evolution and varying relations to the Great Lakes

Ancestry.com. The falls of Niagara : their evolution and varying relations to the Great Lakes [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: Spencer, J. W.. The falls of Niagara : their evolution and varying relations to the Great Lakes : characteristics of the power, and the effects of its diversion. Ottawa: S.E. Dawson, 1907.