Lanthanum
Hawkins' Electrical Dictionary · 1915 · p. 3
—A rare metal belonging to the same group as aluminum.
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Scientific Terms (1927)
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
Chandler's Encyclopedia (1898)
An Illustrated Encyclopedic Medical Dictionary (1893)
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