Spencer, Joseph William Winthrop: - 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. First edition. 8vo, xxxi, 490pp. Frontispiece, 43 plates, 30 text figures, folding map in the rear pocket. Original black cloth, gilt titling to the front board and the spine. Boards lightly rubbed, front inner hinge repaired - overall a good to very good copy.

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