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Widiono, Alfonsus Ryan (2023) Kewenangan Pengelolaan Pertambangan Mineral dan Batubara Ditinjau Dari Pasal 18A Ayat (2) UUD 1945. (The authority to Manage Mineral and Coal Mining is Reviewed from Article 18A Paragraph (2) of the 1945 Constitution). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.