Collection search - Sketch shewing the proposed line of the Rideau Canal from the River Ottawa to the Head of Long Island with the positions of the various works required to complete the navigation. for 44 miles carrying the level of the canal 144 feet above the level of the Ottawa. John By, Lt. Colonel Roy'l. Engrs. Com'g. Rideau Canal, 7th July 1827. [AA 17]. [cartographic material]