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Boustan, Leah Platt, Frydman, Carola and Margo, Robert A. 'Technical Change and the Relative Demand for Skilled Labor: The United States in Historical Perspective.' Human Capital in History: The American Record, ed. Leah Platt Boustan, Carola Frydman, and Robert A. Margo (2014; pubd online May. 2015). Chicago Scholarship Online, <> accessed 07 Jun. 2020.