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Prasetya Marsudi, Duta and Asyifa, Adwiyah (2021) ANALISIS KUALITAS AIR PADA SUMBER MATA AIR DI ALIRAN SUNGAI OPAK (Studi Kasus: Ds. Wukirsari, Cangkringan Sampai Brintikan, Tirtomartani, Kalasan, DAS Opak) ANALYSIS OF WATER QUALITY IN THE SOURCE OF WATER IN THE OPAK RIVER (Case Study: Ds. Wukirsari, Cangkringan to Brintikan, Tirtomartani, Kalasan, DAS Opak). Tugas Akhir thesis, University Technology Yogyakarta.