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National Air Mail Week Covers of IndianaWawaka, Indiana (Noble County), unlisted%u2014May 21,1938.No Backstamp. Greencastle, Indiana (Putnam County), IN579%u2014May 19,1938.No Backstamp. Addressee, H.E.H. (Herrick) Greenleaf, taught at DePauw from 1921 to 1960, and inspired the University%u2019s H.E.H. Greenleaf Memorial Award, which was established for worthy students majoring in mathematics.
