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Y. Astuti http://journal.unnes.ac.id/nju/index.php/jpii SMP Negeri 5 Probolinggo Indonesia
B. Setiawan http://journal.unnes.ac.id/nju/index.php/jpii Program Studi Pendidikan Sains FMIPA Unesa Indonesia
ISSN: 2089-4392
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