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Inge Lehmann
Inge Lehmann (May 13, 1888 – February 21, 1993), Fellow of the Royal Society (London) 1969, was a Danish seismologist who, in 1936, argued that the Earth must not only have a molten interior, but a solid core at the centre, which deflects P waves. She also wrote a book called P, which dealt with P waves and other aspects of seismography.
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