Letter from Hedwig Magher-Eckartt to Otto Haas (1872-1960), congratulating him on his engagement to Phoebe Waterman Haas (1882-1967) and expressing disappointment that he will be tied even more strongly to the United States now.
“Letter from Hedwig Mager-Eckartt to Otto Haas, December, 1913,” December 1913. The Otto Haas Family Papers, Box 2, Folder 7. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/n5skbc4.
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