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Taufik, Muhamad, Agung Setiawan, and Ahmad Khoerul Umam. 2023. “Analisis Indeks Kekeringan Menggunakan Metode Standarized Precipitation Index (SPI) Dan Geographical Information System (GIS) Pada Daerah Aliran Sungai Cokroyasan, Kabupaten Purworejo”. Surya Beton : Jurnal Ilmu Teknik Sipil 7 (2), 159-68. https://doi.org/10.37729/suryabeton.v7i2.3762.