Linder and Grove 1943, Vital Statistics Rates in the United States 1900-1940 (US Census Bureau), Table 12: crude death rates for each cause. Values read by eye into el/us_rates_1910_1938.csv
How it connects
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US death rates 1910 to 1938: encephalitis did not rise in 1918; it peaked in 1920 and 1923
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Sleepy sickness follows flu waves by about a year (Ravenholt and Foege)
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Sleepy sickness and flu rise in the same years