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1Yi Hyŏng-nok = Lee Hyoung-Rok /이 형록 = Lee Hyoung-Rok /per Yi, Hyŏng-nok, 1917-
Publicat 2005
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3Song Tʻae-yun Kyosu sŏktʻan tʻamgu pan segi kinyŏm nonmunjip /宋泰潤教授石炭探究半世紀紀念論文集 /Publicat 1986
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4Yi Hyŏng-nok : photographs by Lee HyoungRok /이 형록 : photographs by Lee HyoungRok /이형록 : photographs by Lee HyoungRok /이 형록 : photographs by Lee HyoungRok /
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