Letter from Elizabeth Waterman (1892-1992) to Otto Haas (1872-1960). Elizabeth Waterman is Otto Haas's sister-in-law. Otto Haas, co-founder of Rohm & Haas, married Phoebe Waterman Haas (1882-1967) in 1914.
Waterman, Elizabeth. “Letter from Elizabeth Waterman to Otto Haas, Undated,” circa 1915. The Otto Haas Family Papers, Box 3, Folder 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/g8gkjwx.
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