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Saidah, Humairo and Muh Bagus Budianto, Muh Bagus Budianto and I Wayan Yasa, I Wayan Yasa and Syamsul Hidayat, Syamsul Hidayat and I Dewa Gede Jaya Negara, I Dewa Gede Jaya Negara and Sulistiyono Heri, Heri Sulistiyono Assessment of Duration and Frequency of Drought by Percent Normal Precipitation Index (PNPI) for Lombok lsland. Jurnal Pascasarjana, Universitas Mataram.