Enriching maritime vocational education with physical-sports activities by Marudut Bernadtua Simanjuntak, Marihot Simanjuntak, Vidya Selasdini, Meilinasari Nurhasanah Hutagaol, April Gunawan Malau, Susi Herawati, Pargaulan Dwikora Simanjuntak, Damoyanto Purba, Derma Watty Sihombing

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