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City proper - Wikipedia
The Difference Between City Proper, Metro Area, and Urban Area - JetPunk
The Bronx - Wikipedia
Boroughs of New York City - Wikipedia
New York City - New World Encyclopedia
Bronx | Urban, Diversity, Culture | Britannica
How NYC's 5 Boroughs Got Their Names - Untapped New York
7 Must-See Spots in New York City's Hidden Gem: City Island, Bronx
History of City Island
The Bronx Travel Guide | What to Do in The Bronx | Rough Guides