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  • Federal

    Atmospheric Pressure

    Contained within the 3rd Edition (1957) of the Atlas of Canada is a plate that shows four maps, one for each of January, April, July and October showing mean sea-level pressure in millibars. These maps were prepared from atmospheric pressure readings taken daily at 00, 06, 12 and 18 hours G.M.T....
    Natural Resources Canada
    Resource Formats:
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    • PDF
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