Further to my previous post, it turns out that the 1932 printing of Advanced English Syntax by C.T. Onions has the same passage, but the list of "conjunctions" does NOT include yet or only. The new edition that I have is a 1985 printing, but the copyright date is 1971, which is after the 1951 mention found by Karl Hagan.
Thanks to Geoff Pullum for tracking this down!
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