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Defisah, A., Heriansyah, M., Irawan, A.W., Kurniawan, D. and Pratiwi, Y.S. 2021. The Contribution of Group Guidance Services to Increasing the Study Concentration of Class X Students at SMA Negeri 3 Samarinda 2020/2021. Educational Studies: Conference Series. 1, 1 (Nov. 2021), 139-144. DOI:https://doi.org/10.30872/escs.v1i1.860.