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Subject (Genre)
- Congresses220
- Executive Department Publications196
- Periodicals174
- Monographs128
- Maps116
- Bibliography83
- Educational films47
- Indexes44
- Internet videos43
- Statistics43
- Handbooks, manuals, etc34
- Annual Reports32
- Conference papers and proceedings26
- Observations26
- Tables18
- Databases17
- Electronic books16
- Dictionaries14
- Early works to 180013
- Academic theses10