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Ruttan, Vernon W. 'The Contribution of Technological Progress to Farm Output, 1950–1975.' Can Economic Growth Be Sustained?: The Collected Papers of Vernon W. Ruttan and Yujiro Hayami, ed. Keijiro Otsuka, and C. Ford Runge (New York, 2011; pubd online Apr. 2015). Oxford Scholarship Online, <http://dx.doi.org/10.1093/acprof:osobl/9780199754359.003.0003> accessed 02 Jul. 2022.