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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Lovell, Jack Swigert and Fred Haise were men of science - highly trained and determined to follow Armstrong and Aldrin to the lunar surface. But things went badly wrong.
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Hunter said: "They were very fierce animals to face in the hunt, so the symbolism of the boar is a lot about the strength of it - a very appropriate adversary in battle."