Helium
Chamber's Twientieth Century Dictionary · 1908 · p. 48
hē′li-um, n. a substance discovered by Lockyer in the sun's atmosphere, found by Ramsay in the rare Norwegian mineral cleveite.
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Scientific Terms (1927)
The American Illustrated Medical Dictionary (1913)
The American Dictionary and Cyclopedia (1910)
A Classical Dictionary (1904)
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