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Periodic Table in Minutes explanations of basic chemistry concepts such as elements and compounds, atomic structure, chemical bonds, reactions and radioactivity
2 years, 3 months
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Examples _ Explanations for Con - Brian A. Blum.pdf
2 years, 3 months
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Ye Panyun -Explanations of Difficult Points in Chinese Learning for Foreigners - 1999.pdf
2 years, 4 months
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