Collection search - Surveys of the Principal Rapids of the River St. Lawrence between Prescott and Lake St. Louis made under the Instructions of the Commissioners of Public Works, by Messrs. Maillefort and Raasloff, Submarine Engrs. in 1854. Division Map No. 1. Galops Rapid. Division Map No. 2, Survey of a Portion North Channel of the Long Sault Rapids. [cartographic material]

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