Collection search - Sorel. Plan of the northern portion of the Seigniory with the islands attached showing the portions that are required to be retained for military purposes. (Signed) T. Bury Lieut. Royal Engineers 4 October 1850. (Signed) Henry Vavasour. Col. Comg. Rl. Engineer. Canada 4 October 1850. Copy. From plan recd. from the Commander in Chief (signed) J. Nightingale. 22 May 1857. [cartographic material]