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Subject (Genre)
- Electronic books295
- Congresses135
- Case studies95
- Statistics20
- History19
- Cross-cultural studies12
- Conference papers and proceedings9
- Biography8
- Early works to 18006
- Handbooks, manuals, etc5
- Longitudinal studies5
- Academic theses4
- Periodicals4
- Electronic book3
- Popular works3
- dissertations3
- Congrès2
- Encyclopedias2
- Aufsatzsammlung1
- Biographies1