Nukman, Saloma, Kaprawi Sahim, and Firdaus Muhammad Saleh. 2020. “THE EFFECT OF FINE COAL IN TUBE MOLDS WHEN POURING ALUMINUM ALLOY 6061 ON WEAR RATE AND HARDNESS VALUE”. GEOMATE Journal 19 (76):48-53. https://geomatejournal.com/geomate/article/view/872.