Sudiyanto A, Probowati D, Arief AA. ANALISIS KELAYAKAN EKONOMI RENCANA PENAMBANGAN BATU ANDESIT DI DESA HARGOREJO, KABUPATEN KULON PROGO DAERAH ISTIMEWA YOGYAKARTA. Prosiding Seminar Nasional ReTII [Internet]. 2017Jan.16 [cited 2024Dec.5];00. Available from: //journal.itny.ac.id/index.php/ReTII/article/view/281