Kuczynski, Jürgen (1904-1997) [Korrespondenzpartner],  Kleeck, Mary van (1883-1972) [Korrespondenzpartner],  Hurlin, Ralph G. [Korrespondenzpartner],  Helps, Rowell [Korrespondenzpartner],  Patton, E. B. [Korrespondenzpartner],  Fried, O. A. [Korrespondenzpartner],  Stewart, Bryce M. [Korrespondenzpartner],  Murphy, Pat W. A. [Korrespondenzpartner],  Dewhurst, Frederic J. [Korrespondenzpartner],  The Commonwealth of Massachusetts / Department of Labor and Industries (Boston) [Korrespondenzpartner],  New York (Staat). Department of Labor [Korrespondenzpartner],  Industrial Commission (Wisconsin) [Korrespondenzpartner],  American Statistical Assotiation / Committee on Governmental Labor Statistics (New York) [Korrespondenzpartner],  Oklahoma. Department of Labor [Korrespondenzpartner],  Federal Reserve Bank of Philadelphia [Korrespondenzpartner],  Russel Sage Foundation / Department of Statistics (New York) [Verfasser],  Russell Sage Foundation / Department of Industrial Studies (New York) [Verfasser],  Russel Sage Foundation / Department of Statistics (New York) [Adressat],  Russell Sage Foundation / Department of Industrial Studies (New York) [Adressat]