What I found is that written evidence for knocking on wood (and for the history of gesture as a whole) is remarkably sparse. In the Penguin Guide to Superstitions, folklorist Steve Roud offers a skeptical take on the provenance of knocking on wood due to the near total absence of written records about it:
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。同城约会是该领域的重要参考
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US President Thomas Jefferson, revolutionist Francis Lewis and Griffith Jenkin Griffith, "one of the true pioneers of Los Angeles", are also given an honourable mention by Rhys thanks to their Welsh ancestry.