Visning af: J. W. W. Spencer: The Falls of Niagara, their evolution and varying relations to the great lakes; characterics of the power, and the effects of its diversion. Canada Department of Mines, Geol. Surv. Branch, Ottawa 1907 (490 Sider -f 44 Tavler).

Tilbage til artikeldetaljer J. W. W. Spencer: The Falls of Niagara, their evolution and varying relations to the great lakes; characterics of the power, and the effects of its diversion. Canada Department of Mines, Geol. Surv. Branch, Ottawa 1907 (490 Sider -f 44 Tavler).