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Subject (Genre)
- Periodicals67
- Congresses65
- Tables36
- Monographs16
- Bibliography14
- Early works to 180014
- Periodical14
- Biography10
- Executive Department Publications10
- Electronic books9
- Annual Reports7
- Conference papers and proceedings7
- Handbooks, manuals, etc7
- Atlases5
- Dictionaries5
- Indexes5
- Classification4
- Early works4
- Problems, exercises, etc4
- Academic theses3