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Irawan, F.A.J.E. and Wahyuni, A. 2026. Cost And Productivity Analysis Of Installing 40 X 60 X 120 U-Ditches Using Heavy Equipment Compared To Manual Methods In Sumur Welut, Lakarsantri District, Surabaya: Analisis Biaya Dan Produktivitas Pemasangan U-Ditch 40 X 60 X 120 Menggunakan Alat Berat Dibandingkan Metode Manual Di Sumur Welut, Kec. Lakarsantri, Surabaya. Indonesian Journal of Innovation Studies. 27, 2 (Oct. 2026), 10.21070/ijins.v27i2.2438. DOI:https://doi.org/10.21070/ijins.v27i2.2438.