The Spanish flu (1918-20): The global impact of the largest influenza pandemic in history - Our World in Data
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Decorah-posten. [volume] (Decorah, Iowa) 1874-1903, March 24, 1899, Image 7 « Chronicling America « Library of Congress
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Data om overdødelighed viser pandemiens alvor: »De her tal kommer ikke af sig selv« - Dagens Medicin
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