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Novianto, Anang and Asyifa, Adwiyah (2021) ANALISIS KUALITAS AIR PADA SUMBER MATA AIR DI ALIRAN SUNGAI OPAK (Studi Kasus : Ds. Brintikan, Tirtomartani sampai hilir DAS Opak) ANALYSIS OF WATER QUALITY IN THE SOURCE OF WATER IN THE FLOW OF OPAK RIVER (Case Study: Ds. Brintikan, Tirtomartani to the downstream of the Opak watershed). Tugas Akhir thesis, University Technology Yogyakarta.