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Subject (Genre)
- Congresses218
- Executive Department Publications196
- Periodicals179
- Monographs128
- Bibliography75
- Educational films47
- Indexes44
- Internet videos43
- Statistics35
- Annual Reports32
- Handbooks, manuals, etc28
- Conference papers and proceedings26
- Observations26
- Electronic texts25
- Tables19
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- Early works to 180013
- Academic theses12