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NYC 1850s: A Metropolis Emergence and Cultural Fusion - History 101 NYC
Rare Historic Photos of New York City in the 1850s
History of New York City (1855–1897) - Wikipedia
NYC 1800-1840: Port City to Commercial Powerhouse Evolution
Map of the city of New York, 1850 - NYPL Digital Collections
OldNYC: Mapping Historical Photographs of New York City
1850 NYC Skyline: The Birth of a Global Metropolis - History 101 NYC
Life in the big city – New York circa 1850 - Harvard University
Mapping Historical New York
19 Incredible Photos Giving a Window Into 19th Century New York