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Source/Further reading:

History, overview: https://www.history.com/topics/invent...

Britannica, overview: https://www.britannica.com/science/ch...

Podcast on cholera and India: https://thewire.in/thesciences/scrol...

Cholera Riots: http://protomag.com/articles/ragestr...

Cholera in London: http://www.choleraandthethames.co.uk/...

Science Museum, London and Cholera: https://www.sciencemuseum.org.uk/obje...

Time, Cholera in Paris: https://time.com/5837393/parischoler...

Bloomberg, how Cholera transformed Paris: https://www.bloomberg.com/news/featur...

Cholera in France: https://www.rfi.fr/en/visitingfrance...

Cholera in NYC: https://www.nytimes.com/2008/04/15/sc...

Slate, Tambora and cholera: https://slate.com/technology/2014/04/...

Geographics on Mt Tambora:    • Mount Tambora: The Year Without a Summer