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AURORA
Plate I.
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| Fig. 1—TWO TYPES OF AURORAL ARCS. |
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| Fig. 2—TWO TYPES OF AURORAL RAYS. |
(From the Internationale Polarforschung, 1882–1883, by permission of the
Kaiserlichen Akademie der Wissenschaften, Vienna.)
Page:EB1911 - Volume 02.djvu/977
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