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“Analisa XRD Terhadap Perubahan Struktur Dan Kristalinitas Karbonisasi Batubara Sawahlunto – Sijunjung Sumatera Barat: XRD Analysis of Changes in the Structure and Crystallinity of Sawahlunto - Sijunjung West Sumatra Coal Carbonization”, st, vol. 2, no. 1, pp. 88–91, Jan. 2019, doi: 10.32734/st.v2i1.321.