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Books about Ruzhang:
Esoteric Iron Palm of Gu Ruzhang (Chinese Edition) by Yan Bin (Jul 1, 2012)
Wiki information Ruzhang:
Gu Ruzhang or Ku Yu-Cheung was a Chinese martial artist who disseminated the Bak Siu Lahm martial arts system across southern China in the early 20th century. Gu was known for his expertise in Iron Palm hand conditioning among other Chinese martial...