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⁴⁄₃₀ of the first hits for "phœnomena" are scannos for phænomena: , , ,  — the caveat attached to *phœnomena also applies here; moreover, I didn’t find any undoubtedly verifiable instances of *phœnomena in the first thirty hits, so I maintain my request for the verification of the plural form.
Heaven only knows why this error occurs (at least in the singular); still less explicable would be if only the singular saw such use, and the plural were unattestable. Quotations with links to visible scans of the source texts’ pages, please. †﴾(u):Raifʻhār(t):Doremítzwr﴿ 23:11, 8 September 2009 (UTC)
I’ve done what I can; please check them to make sure what I’ve done is correct. (I didn’t know how to present the one that looks like it was written in 1785.) No offence, but these citations are of a very poor quality; they need page numbers, links, &c. — see WT:QUOTE. Please fix in them what I cannot.
phœnomenafailed, deleted. phœnomenonnot acceptably cited as far as I can tell; I can't confirm that the sources actually used the O-E ligature, but I do find evidence that they didn't. Please find citations that can be confirmed; Google's "No Preview Available" is just a euphemism for "probably a scanno". :-P
—RuakhTALK 05:48, 22 February 2010 (UTC)