Diary of a magnetic survey of a portion of the dominion of Canada chiefly in the North-Western territories executed in the years 1842-1844 Lefroy, J. H. Sir, (John Henry) 1817-1890

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Lefroy, J. H. Sir, (John Henry) 1817-1890
Geomagnetism -- Canada; Geomagnetism - United States.; Magnetism, Terrestrial -- Canada.
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