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Bakker, Gerben, Crafts, Nicholas and Woltjer, Pieter (2015) A vision of the growth process in a technologically progressive economy: the United States, 1899-1941. Economic History working papers, 226/2015. The London School of Economics and Political Science, London, UK.
Williamson , Jeffrey (2012) America's first century: growth and inequality 1774-1860. In: Modern and comparative economic history seminar, 8th November 2012, London School of Economics and Political Science. (Unpublished)