6 relations: Depth sounding, Frederick Cook, Lisunov Li-2, North Pole, Robert Peary, Soviet Union.
Depth sounding
Depth sounding refers to the act of measuring depth.
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Frederick Cook
Frederick Albert Cook (June 10, 1865August 5, 1940) was an American explorer, physician, and ethnographer, noted for his claim of having reached the North Pole on April 21, 1908. This was nearly a year before April 6, 1909, the date claimed by the American explorer Robert Peary, and the accounts were disputed for several years. His expedition did discover Meighen Island, the only discovery of an island in the American Arctic by a United States expedition. After reviewing Cook's limited records, a commission of the University of Copenhagen ruled in December 1909 that he had not proven that he reached the pole. In 1911 Cook published a memoir of his expedition, continuing to assert their success. His 1906 account of having reached the summit of Denali has also been discredited.
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Lisunov Li-2
The Lisunov Li-2, originally designated PS-84, was a license-built version of the Douglas DC-3.
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North Pole
The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is (subject to the caveats explained below) defined as the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.
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Robert Peary
Rear Admiral Robert Edwin Peary Sr. (May 6, 1856 – February 20, 1920) was an American explorer and United States Navy officer who made several expeditions to the Arctic in the late 19th and early 20th centuries.
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Soviet Union
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR) was a socialist state in Eurasia that existed from 1922 to 1991.
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References
[1] https://en.wikipedia.org/wiki/Aleksandr_Kuznetsov_(explorer)