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Subject (Genre)
- Observations76
- Periodicals75
- Handbooks, manuals, etc60
- Legislative hearings33
- Congresses27
- Observers' manuals22
- Maps21
- Executive Department Publications15
- Statistics15
- Annual Reports13
- Databases13
- Bibliography10
- Charts, diagrams, etc10
- CD-ROMs9
- Diaries9
- Rules and practice7
- Biography6
- Early works to 18006
- Electronic books6
- History6