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National Air Mail Week Covers of IndianaCottage Grove, Indiana (Union County), IN331%u2014May 16,1938.No Backstamp. No Cachet. The Cottage Grove Post Office was in operation from 1848 to 1951.Signed in return address by Cottage Grove Postmaster Verda E. Hampton. Lake Village, Indiana (Newton County), IN778%u2014May 21,1938.No Backstamp.
