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John M. Barry, Barry, John M.: The Great Influenza (2005, Penguin Books)

At the height of WWI, history's most lethal influenza virus erupted in an army camp …

Review of 'The Great Influenza' on 'Goodreads'

Having read several books on Spanish Flu, this is the most interesting one I've read to date. Covers both the scientific and sociological aspects well.