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Keywords from Image Description:
Humboldt gasmask . Humboldt's first gasmask English scanned from HUMBOLDT Alexander von Ueber die unterirdischen Gasarten und die Mittel ihren Nachtheil zu vermindern Ein Beytrag zur Physik der praktische Bergbaukunde Braunschweig Friedrich Vieweg vo With engraved folded plates Alexander von Humboldt public domain PDold Check