- Economics (19)
- Sociology (14)
- Economic policy (2)
- Agriculture--Economic aspects (1)
- Bombach, Gottfried (1)
- Economic development (1)
- Industrial sociology (1)
- Philosophy (1)
- Social policy (1)
- Social problems (1)
- Socialism (1)
- Sociologists--Germany--Correspondence (1)
- Weber, Max, 1864-1920--Correspondence (1)