Vereinigten Chemischen Fabriken Leopoldshall A.G. “Letter from Vereinigten Chemischen Fabriken to Dow Chemical Company, December 18, 1908,” December 18, 1908. Papers of Herbert H. Dow, Box 139, Folder 080017. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/p8w787h.
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