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Subject (Genre)
- Internet videos117
- Congresses78
- Biography54
- Periodicals50
- Statistics46
- Case studies40
- Juvenile literature35
- Pictorial works32
- Early works to 180026
- Interviews26
- Directories24
- Sources22
- Electronic books20
- History18
- Legislative Report - Public Bills18
- Terminology18
- Educational films16
- Controversial literature15
- Handbooks, manuals, etc12
- Bibliography11