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Kiagus, Ahmad Roni and Elfidiah, Elfidiah and Heni, Juniar and Desi, Andrayani TURNITIN MANUFACTURE OF SILICA GEL FROM COCONUT WASTE WITH THE INFLUENCE OF EXTRACTION TIME AND SODIUM HYDROXIDE CONCENTRATION. FAKULTAS TEKNIK UNIVERSITAS MUHAMMADIYAH PALEMBANG. (Unpublished)