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https://doi.org/10.1038/143243a0
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Cite Journal: Nature |  Publication Date: Feb 11, 1939 |
 Citations: 8 |
Affiliation: Cavendish Hospital
THE interesting letter by Harang and Stoffregen1, concerning ionospheric radio wave reflections at Tromso, prompts the recollection of some observations made by us at the same observatory during the Second International Polar Year, 1932–33, on a type of radio echo which seems peculiar to polar regions.
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