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1911 Encyclopedia Britannica
My attempts to actually put the Greek letters in appear to have run afoul of some prohibition on external links. Any help? John Kenney 17:02, 9 Jun 2007 (EDT)
These files are public domain.
Chisholm, Hugh, General Editor. Entry for 'Talk a'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/t/talk-a.html. 1910.