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Putri1, N.T and Zadry, H.R and Mahata, M.E and Amrina, E and Yuliandra, B and Humaida, N (2020) Ergonomics Evaluation of Manual Material Handling Activities in the Section of Feeding Laying Hens at Poultry Farm. IOP Conf. Series: Materials Science and Engineering. ISSN 1757-899X