1959. 2012-09-27T15:54:59Z. 2013-03-18T22:20:15Z. Gravenor, C. P. Geological Survey of Canada. English. Public. Ontario, Port Hope Region, Oshawa Region, Whitby Region, Peterborough Region, and Lindsay Region.
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1959. 2012-09-27T17:03:48Z. 2021-10-01T21:33:42Z. Gravenor, C. P. The Survey. English. Public. Ontario, Durham County, Peterborough (County), Victoria (County), Northumberland County, and Ontario County.
