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:
Трамп высказался о непростом решении по Ирану09:14，这一点在91视频中也有详细论述
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（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。。关于这个话题，旺商聊官方下载提供了深入分析
This happened with Engramma, my tool for editing JSON with design tokens. No phishing, no malware, only anonymous analytics.