Keywords: Ludolf van Ceulen.jpeg Ludolph van Ceulen aus http //www-history mcs st-and ac uk/history/PictDisplay/Van_Ceulen html public domain de wikipedia 2005-01-17 Dr Manuel wikipedia de PD-old original upload log page de wikipedia Ludolf_van_Ceulen jpeg 2005-01-17 21 49 Dr Manuel 268×326×8 32799 bytes <nowiki>Ludolph van Ceulen</nowiki> Ludolf van Ceulen Portraits of men Fencing masters |