קובץ:Measles incidence-cdc.gif

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יומן העלאה מקורי

• 2006-02-20 00:14 Midgley 380×230×8 (6426 bytes) Incidence of Measles in USA around time of introduction of Measles immunisation. From US CDC. As a US Gov agency they do not assert copyright, this is PD.