Correspondence from Peter F. Drucker to Ernst Keller thanking Keller for writing and for years of friendship. Drucker cautions Keller not to overload himself in the midst of his break from ADELA, and that he hopes Keller gets the rest he needs. Drucker also extends an invitation to Keller for a visit.
Drucker, Peter F. (Peter Ferdinand), 1909-2005 ADELA Investment Company Keller, Ernst, 1931-2006 Lima (Peru)
Source
Correspondence from Peter F. Drucker to Ernst Keller thanking Keller for writing and for years of friendship, November 3, 1975; Drucker Archives; Box 9, Folder 12; 2 pages
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