Taechʻŏng taem sujil anjŏn taechʻaek ŭi kyŏngbi pudam pangan / yŏnʾgu chʻaegimja Yi Sang-yong ; yŏnʾguwŏn Yi Chŏng, Yi Pyŏng-gi
大淸댐水質保全對策의經費負擔方案 / 硏究責任者李相龍 ; 硏究員李晶, 李丙起

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