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  1. List of largest optical telescopes in the 19th century - Wikipedia

  2. Marvels of 19th CENTURY TELESCOPES - Star GAZING Secrets

  3. History of the telescope - Wikipedia

  4. Astronomy in the 19th century - Royal Museums Greenwich

  5. List of largest optical telescopes in the 19th century

  6. 19th-century telescopes

  7. Golden Era of Refractors (Cosmology: Tools) - AIP

  8. The Great Refractor – Harvard College Observatory

  9. Discover 19TH CENTURY ASTRONOMY WONDERS - Explore …