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Subject (Genre)
- Internet videos117
- Congresses79
- Biography54
- Periodicals51
- Statistics44
- Case studies40
- Juvenile literature35
- Pictorial works30
- Early works to 180026
- Interviews25
- Directories23
- Sources22
- Electronic books19
- Legislative Report - Public Bills18
- Terminology18
- History17
- Educational films16
- Controversial literature15
- Handbooks, manuals, etc12
- Bibliography11