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List of largest optical telescopes in the 19th century - Wikipedia
Marvels of 19th CENTURY TELESCOPES - Star GAZING Secrets
History of the telescope - Wikipedia
Astronomy in the 19th century - Royal Museums Greenwich
List of largest optical telescopes in the 19th century
19th-century telescopes
Golden Era of Refractors (Cosmology: Tools) - AIP
The Great Refractor – Harvard College Observatory
Discover 19TH CENTURY ASTRONOMY WONDERS - Explore …