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Ku Chŏng

1543 – 1620

  • Kugyŏk Hanʾgang chip =Kugyŏk Hanʾgang chip =
  • Hanʼgang chŏnjipHanʼgang chŏnjip
  • Tʻaegŭk munbyŏnTʻaegŭk munbyŏn
  • 太極問辯太極問辯