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illuminatisacrep00llul_0034 (1)
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leibniz calculator machine-800px
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leibniz-frontispiece-detail
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leibniz
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GulliversTravels_machine
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bub_gb_k334cEAvl5gC_0046
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leibniz-calculator-frontispiece
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Fotothek_df_tg_0005486_Mathematik_^_Kombinatorik
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illuminatisacrep00llul_0049
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leibniz-machine copy
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leibniz-machine copy