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Subject (Genre)
- Congresses146
- Sources79
- Electronic books66
- Legislative Report - Public Bills63
- History61
- Periodicals58
- Rules and practice51
- Biography40
- Bibliography32
- Case studies30
- Data sets28
- Directories28
- Early works to 180026
- Executive Department Publications22
- Dictionaries21
- Handbooks, manuals, etc21
- Tracts (literary works)18
- Constitutional amendments17
- Registers14
- Etchings13