Rety Winonazada, Listiyawati Nugraha, S. Koesnaryo. Limestone Hardness Classification Based on Compressive Strength Value in Ponjong District, Semanu District, and Tanjungsari District, Gunung Kidul Regency, Yogyakarta. Prosiding Seminar Nasional ReTII [Internet]. 2020Oct.27 [cited 2024Apr.18];:221-6. Available from: //journal.itny.ac.id/index.php/ReTII/article/view/2051