Correspondence from Peter F. Drucker to Ernst Keller regarding Keller's fatigue and need of a vacation. Drucker indicates that he is writing as an old friend, and that he noticed Keller repeating himself during a meeting. He insists that Keller take an extended vacation from ADELA.
Drucker, Peter F. (Peter Ferdinand), 1909-2005 ADELA Investment Company
Source
Correspondence from Peter F. Drucker to Ernst Keller regarding Keller's fatigue and need of a vacation, January 15, 1974; Drucker Archives; Box 9, Folder 11; 1 page
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