594.I.2.01385: Brief van Alvin Johnson, managing editor van de Encyclopedia of the Social Sciences, aan H. de Man. New York

By de Man, Hendrik
Date 1929-1929

594.I.2.01389: Note to author van de Encyclopedia of the Social Sciences. New-York

By de Man, Hendrik
Date 1930-1930

594.J.8: The Social Sciences and the Crisis of our Age

By de Man, Hendrik

594.J.8.01608: Typoscript van het artikel The Social Sciences and the Crisis of our Age

By de Man, Hendrik