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  • AstDys entry on 391 Ingeborg
  • Lightcurve plot of (391) Ingeborg, Antelope Hills Observatory
  • Asteroid Lightcurve Database (LCDB), query form (info )
  • Dictionary of Minor Planet Names, Google books
  • Asteroids and comets rotation curves, CdR – Geneva Observatory, Raoul Behrend
  • Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center