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A contour map presenting the secular change in the vertical intensity of the Earth's magnetic field from 1885 to 1922. Picture

A contour map presenting the secular change in the vertical intensity of the Earth's magnetic field from 1885 to 1922.

A contour map presenting the secular change in the vertical intensity of the Earth’s magnetic field from 1885 to 1922.

Photo Date: 1940 Ca.

Author: NOAA

License: Public Domain Mark 1.0 (Public domain)
640 x 524 117.00 KB
1280 x 1048 360.06 KB
1899 x 1554 856.22 KB
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Added On
16th October 2015
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