Carboniferous
Jack's Reference Book for Home and Office : An Encyclopaedia of General Information: English Dictionary · 1909 · p. 1
containing coal, C: [s. 1044]
Bu kavram başka kaynaklarda da geçiyor
A Dictionary of Scientific Terms (1927)
Everybody's Encyclopedia (1912)
The American Dictionary and Cyclopedia (1909)
Chandler's Encyclopedia (1898)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopedic Medical Dictionary (1892)
Dictionary of Science, Literature and Art (1842)
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