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The Changing Shape of Ontario: a Guide to Boundaries, Names and Regional Governments - Page Banner

County of Ontario

Superseded in 1973, along with Durham County, by the Regional Municipality of Durham.

County of Ontario

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

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