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2Hwangyongkwon sidae ui sijak kwa hwangyongsa /환경권 시대 의 시작 과 환경사 /Published 2014“...Han'guk Hwan'gyŏng Kyoyuk Hakhoe...”
Book -
3Hwan'gyŏngkwŏn sidae ŭi sijak kwa hwan'gyŏngsa /환경권시대의시작과환경사 /Published 2014“...Han'guk Hwan'gyŏng Kyoyuk Hakhoe...”
Book