Single sheet. Col. ms. Medium: Segmented and backed. Scale: 1:150 000 (bar). Cartographic Note: Scale in miles. Additional Places: Canada. Contents Note: Shows Simcoe's route from Hollands River and back, Contains a note on the navigability of Lake Simcoe.

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Sketch of communication from York on Lake Ontario to Glouscester [sic] or Machidash Bay Lake Huron taken by Lieut.t Pilkington of the Roy.l Engineers and Alex.r Aitken Deputy Surveyor in October 1793.