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:
5年的“巩固”“拓展”“衔接”，在守牢防止规模性返贫致贫底线的同时，如何下好乡村全面振兴这盘大棋？，更多细节参见Line官方版本下载
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Мощный удар Израиля по Ирану попал на видео09:41。业内人士推荐WPS官方版本下载作为进阶阅读
“If you took a satellite picture of the game world in 2005, you’d have essentially a complete province already,” Sultan of Rum said. “But the trouble was that the quality wasn’t good; there was no coherence. The 5 percent of the work to just create a landmass was done, but the management wasn’t there.”