(Text Page to) (19) Atmospheric pressure : January mean sea-level pressure in millibars -- April mean sea-level pressure in millibars -- July mean sea-level pressure in millibars -- October mean sea-level pressure in millibars. Compiled from information supplied by the Meteorological Division, Department of Transport. (Canada Department of Mines and Technical Surveys.)
Descriptive text on verso of (19) Atmospheric pressure: These maps were prepared from atmospheric pressure readings taken daily at 00, 06, 12 and 18 hours G.M.T. during the period 1940-1949 inclusive, except for the area north of 72 1/2˚N., where the period was 1948-1953 inclusive, and for which the...
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Department of Mines and Technical Surveys, Geographical Branch
1953
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