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  • Copernicus and five other astronomers with astronomical instruments. Engraving by J. Mulder after G. Hoet, 1692.
  • Gerardus Johann Mulder. Line engraving by D. J. Sluyter, 1854, after B. de Porter.
  • Gerardus Johann Mulder. Line engraving by D. J. Sluyter, 1854, after B. de Porter.