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Rochyani, N and Ngudiantoro, N and Harris, Helmi Analysis on the influence of rainfall and mine water ratio against pH in East pit 3 West Banko coal mine. Sriwijaya International Conference on Engineering, Science and Technology (SICEST 2016). ISSN 2261-236X
Harris, Helmi and Rochyani, N and Widayatsih, T Packaging design and determination of shelf life Pundang Seluang. Journal of Physics: Conference Series, 1375.
Harris, Helmi and Rochyani, N and Widayatsih, T Packaging design and determination of shelf life Pundang Seluang. Journal of Physics: Conference Series.