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https://www.niigata-nippo.co.jp/articles/-/597493

Title:

佐渡で初めて前方後円墳発見、加茂湖周辺の丘陵に2基…日本海側最北、古墳時代前期（４世紀）の築造か

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新潟日報デジタルプラス

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