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370 a.c Describe enfermedades pulmonares en mineros
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23 d.C. – Plinio el Viejo recomienda usar vejigas de animales como protección contra polvos tóxicos.
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.