“Spektroskop.” In Marpmann's Illustrirte Fachlexika Der Gesammten Apparaten-, Instrumenten- Und Maschinenkunde, Der Technik Und Methodik Für Wissenschaft, Gewerbe Und Unterricht. Leipzig, Germany: P. Schimmelwitz, 1902. https://digital.sciencehistory.org/works/x920fw877.
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