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      Canada - Lake Huron Georgian Bay to Clapperton Island Surveyed by Staff Commander J. G. Boulton, R. N., assisted by Messrs. W. J. Stewart and D. C. Campbell, 1885 under the orders of the Government of the Dominion of Canada The portion engraved lightly is taken from a Survey by …

      Lake Huron - North Channel Clapperton I. to Mildram Pt. Surveyed by Staff Commander J. G. Boulton, R. N., assisted by Messrs. W. J. Stewart and D. C. Campbell, 1887-8. under the orders of the Government of the Dominion of Canada. Magnetic Variation in 1889, increasing 4' annually. All ...