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Start Over Collections Images from the History of Medicine (IHM) ✖Remove constraint Collections: Images from the History of Medicine (IHM) Subjects Silicon Dioxide ✖Remove constraint Subjects: Silicon Dioxide Subjects Geology ✖Remove constraint Subjects: Geology Subjects Colorado ✖Remove constraint Subjects: Colorado Genre Pictorial Works ✖Remove constraint Genre: Pictorial Works Copyright Public domain ✖Remove constraint Copyright: Public domain

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