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Subject (Genre)
- History148
- Periodicals133
- Statistics71
- Sources47
- Congresses45
- Directories37
- Handbooks, manuals, etc22
- Electronic books21
- Legislative hearings19
- Biography18
- Exhibitions17
- Commercial treaties16
- Early works to 180014
- Maps9
- Conference papers and proceedings6
- Television news programs6
- Annotations5
- Academic theses4
- Documentary television programs4
- Guidebooks4