Recherche dans la collection - Sheet "C". Topographical Map of the country Lying between Allanburgh and Port Dalhousie shewing the position of the New Welland Canal its Locks, Weirs' Basins, and other Works. Reduced from Surveys made in 1870-1. [with a list dated Jan. 27, 1930 giving the Water Power Leases on Old Welland Canal between Locks Nos. 25 & 3 inclusive] Thorold, December 1879 Thomas Monro. [cartographic material]