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County of Northumberland

Once part of the United Counties of Northumberland and Durham, it was partly superseded in 1973, along with Durham County, by the Regional Municipality of Durham.

County of Northumberland

County of Northumberland
No. 21a - The Southern Part of the Province of Ontario - (Detail) Northumberland
Province of Ontario. Department of Lands & Forests
RG 1-707 Ministry of Natural Resources topographic maps