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Atthalah, Laksana Fadhil (2025) Analisis Kebutuhan Bahan Baku pada Proses Pengolahan Air Bersih di IPAM Ngagel Surabaya. (Analysis of Raw Material Requirements in the Clean Water Treatment Process at IPAM Ngagel Surabaya). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.