Recherche dans la collection - Section No. 22. Sketch of the proposed works at Jack's Rifts. Section No. 21. Sketch of proposed works at Belidors Rifts. Section No. 20. Sketch of the proposed Works at Brewer's Lower Mills. John By, Lt. Colonel Roy'l. Engrs., Com'g. Rideau Canal, 25th October 1827. AA 20. [cartographic material]

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