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The Initial Process of Dam Construction is Seen from a Topographical Perspective (Bench Mark Coordinates and Control Point Coordinates): Case study of D.I. Bajayu Kab Serdang Bedagai . IJIRCST [Internet]. 2023 Mar. 30 [cited 2024 Jul. 23];11(2):34-7. Available from: https://acspublisher.com/journals/index.php/ijircst/article/view/10272