The Origins of the Basic Inventions Underlying Du Pont's Major Product and Process Innovations, 1920 to 1950

Willard F. Mueller, The Rate and Direction of Inventive Activity: Economic and Social Factors (Princeton University Press, 1962), https://www.nber.org/books-and-chapters/rate-and-direction-inventive-activity-economic-and-social-factors/origins-basic-inventions-underlying-du-ponts-major-product-and-process-innovations-1920-1950.