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Husaepah, Husaepah (2023) Analisis Kelayakan Investasi Pengembangan Layanan Air Bersih Spam Dumaring Kecamatan Talisayan Kabupaten Berau (Feasibility Analysis of Investment in the Development of Clean Water Services Spam Dumaring, Talisayan District, Berau Regency). Masters thesis, Universitas 17 Agustus 1945 Surabaya.