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Robert Tua Siregar, Hery Pandapotan Silitonga, ā€œDevelopment of Wastewater Treatment (Ipal) Communal Plant in Village Pardomuan Nauli in the District Laguboti District Toba Samosir with the Power of Community Participationā€, IJAST, vol. 29, no. 06, pp. 7609-7617, Jun. 2020.