52
NATIONAL GEOGRAPHIC SOCIETY
NATIONAL GEOGRAPHIC SOCIETY,
1986,
53
NATIONAL GEOGRAPHIC SOCIETY
NATIONAL GEOGRAPHIC SOCIETY,
1986,
54
NATIONAL GEOGRAPHIC SOCIETY
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1986,
57
Korean Geotechnical Society
Korean Geotechnical Society,
1999,
58
Korean Geotechnical Society
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1999,
59
Hong Sung-Wan
Balkema,
1999,
60
Korean Geotechnical society
Korean Geotechnical society,
1999,
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