Syafyudin, B. A., Rizal, rizal, & Rusfiandi, wandi. (2021). THE USE OF COCONUT SHELL CHARCOAL AS AN ADDED MATERIAL TO THE CONCRETE MIX OF Fc’ 14,53 MPa. RETENSI, 1(2), 43-49. https://doi.org/10.31573/retensi.v1i2.321