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Please note that there is a printed publication: National Academy of Sciences, Biographical memoir of William Francis Hillebrand by Frank W. Clarke, Autumn meeting, 1925, p.50, which document that Harold N. Hillebrand was the son of William Francis Hillebrand and that he was professor of English literature at the University of Illinois.--Warboerde (talk) 13:18, 30 August 2011 (UTC)