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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玻利维亚央行尚未公布损失的具体金额，但表示将采取措施防止流失钞票流入市场造成金融混乱。。heLLoword翻译官方下载对此有专业解读
Раскрыты подробности похищения ребенка в Смоленске09:27