By
Wikipedia
By
The New York Times
By
Dream Of A City
By
Barry Lawrence Ruderman Antique Maps
By
Reddit
By
Historical Photographs of China
By
Dream Of A City
By
Digital Commonwealth
By
Dream Of A City
By
Alamy
By
Library of Congress
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Beijing Postcards
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Wikimedia Commons
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Alamy
By
Reddit
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Dream Of A City
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Wikidata
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MIT Visualizing Cultures
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Digital Commonwealth
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Alamy
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