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1P'yŏngan-do chiyŏk Koguryŏ sansŏng = Koguryo fortresses in Pyongan province /평안도 지역 고구려 산성 = Koguryo fortresses in Pyongan Province /평안도 지역 고구려 산성 = Koguryo fortresses in Pyongan Province /평안도 지역 고구려 산성 = Koguryo fortresses in Pyongan province /평안도 지역 고구려 산성 = Koguryo fortresses in Pyongan province /평안도 지역 고구려 산성 = Koguryo fortresses in Pyongan province /Published 2017
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