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The Guinness Encyclopedia
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The Guinness Encyclopedia - Wayzata Technology (3221-1B) (Disc 1) (1995).iso
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102-3
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1995-05-11
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PRESSURE CHARTS 7 -7 KEY mb 980 Isobars (lines linking points experienang same 990 atmospheric pressure). The pressures are in millibars (mb): I millibar _= 100 newtons per m2 or 0.75mm of mercury. 1000 JI Low pressure High pressure 1010 Warm front Cold front Occluded front 1020 5 Wind strengths and direction: 10 knots ( 18.5 km/h) 15 knots [27.75 km/h) H 20 knots (37 km/h) 25 knots (46.25 km/h) 30 knots (55.5 km/h) 50 knots (92.5 km/h) Calm 15 16 [14 Figures are temperatures (º℃) H
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 (Disc 1) (1995).iso/mac/earth/102-3/102-3.png)