References: Chapter 2 · Impermissible and Unavoidable in Equal Measure
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John Snow memorial pump, Broadwick Street, Soho, London (replica installed by the John Snow Society / commemorative pump).
John Snow Society - the Broad Street pump and annual 'Pumphandle' commemoration.
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Tulchinsky TH. "John Snow, Cholera, the Broad Street Pump; Waterborne Diseases Then and Now." In: Case Studies in Public Health. Academic Press, 2018:77-99.
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London School of Hygiene & Tropical Medicine, 'John Snow memorial pump marking historic cholera outbreak reinstalled in its rightful home' (2019).
'John Snow (public house),' Wikipedia — gives address (39 Broadwick Street), former name (Newcastle-upon-Tyne), renaming in 1954 (centenary of pump-handle removal), and Samuel Smith's ownership.
Samuel Smith Old Brewery (Tadcaster) pub directory — The John Snow, 39 Broadwick Street, Soho, London.
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Snow J., reproduced via UCLA John Snow site / Photo Tour of Broad Street Pump Outbreak.
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Doll-Hill (1950) to Master Settlement Agreement (1998) = 48 years (PMC4465196 historical review).
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U.S. liquid gallon = 3.785411784 L (international definition).
U.S. EPA, 'Healthy Swimming' / residential pool operation references (typical backyard pool ~15,000-20,000 US gallons).
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Sotnikova M & Nikolskiy P, 'Systematic position of the cave lion Panthera spelaea... ,' Quaternary International 245(2):243-252, 2011; with body-mass estimates ~250-400 kg.
Arithmetic: 1 trillion seconds = 1e12 s / 31,536,000 s per 365-day year = 31,709.79 years (or / 31,557,600 s per Julian year = 31,688.09 years).
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