Hulek, Arnold Beckman's secretary, responds to a letter from Manning requesting the overhaul of a spectrophotometer. She explains that Beckman himself is in Nevada observing an atomic bomb test.
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Hulek, G. F. “Letter from G. F. Hulek to Dr. Paul D. V. Manning,” April 26, 1955. Beckman Historical Collection, Box 14, Folder 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/37720d088.
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