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Books about Heyel:
Hunting The Heyel (The Darad Series Book 2) by Daphne Hilsdon (Jan 12, 2014)
Human-Relations Manual for Executives by Heyel, Carl by Carl Heyel (1939)
Modern excutive technique,: An introduction to the Funk & Wagnalls Reading course in executive technique, (Reading... by Carl Heyel (1948)