Heptagon
The Optical Dictionary · 1904 · p. 9
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Bu kavram başka kaynaklarda da geçiyor
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
Chandler's Encyclopedia (1898)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopedic Medical Dictionary (1893)
An Illustrated Dictionary of Words Used In Art and Archealogy. (1883)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1854)
Dictionary of Science, Literature and Art (1842)
A Military Dictionary (1810)
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