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Houghton GC.L.Bt Jacob Leupold Rechen Machine. en Illustration labeled Tab VIII Rechen machine des hrn Baron von Leibnitz from Theatrum arithmeticogeometricum das ist SchauPlatz der rechen und MessKunst by Jacob Leupold lib harvard edu GC Bt Houghton Library Harvard University lib harvard edu GC Bt Houghton Library Harvard