Recherche dans la collection - Lt. Col. By's projected improvement for steam boat navigation to surmount the Sault des Recollet & Cheval de Terre, Riviere des Prairies, No.4 E.T. Ford, Lt. Col. R.E. Octr. 26th 1831. (Signed) John By, Lt. Col., Royl Engr Comg Rideau Canal 22nd January 1831. Board of Works Office Document [cartographic material]

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