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| Wikipedia, Edwin Chadwick |
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| The New York Times, How Epidemics Helped Shape the Modern Metropolis |
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| The New York Times, How Epidemics Helped Shape the Modern Metropolis |
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| Revolvy., John Griscom |
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| Wikipedia, 1966 New York City smog |
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| Smithsonian, Doctor's Orders: The Growth of the Public Health Movement |
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