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Aprilliano , F.; Tugur Redationo, N.; Cristanto Putra Mbulu, B. COMPARISON OF VARIATIONS OF ROBUSTA AND ARABIKA COFFEE GROUNDS BY COMPOSITION (60%: 40%, 50%: 50%, 40%: 60%) TO DETERMINE THE HARDNESS AND CALORIFIC VALUE OF BRICKETS. METAL 2025, 3, 01-07.