In the 1930s, this study was Unemployment and technological change(Report no. G-70, 1940) by Corrington Calhoun Gill of the 'National Research Project on Reemployment Opportunities and Recent changes in Industrial Techniques'.
В 1930-х годах таким исследованием было Unemployment and technological change (Report no. G-70, 1940) Каррингтона Калхуна Джилла (Corrington Calhoun Gill) из 'National Research Project on Reemployment Opportunities and Recent changes in Industrial Techniques'.