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Subject (Genre)
- Periodicals305
- Periodical176
- Electronic books54
- Internet videos45
- Handbooks, manuals, etc41
- Educational films35
- Executive Department Publications35
- Early works to 180029
- Instructional films27
- Congresses17
- methods17
- Examinations, questions, etc14
- Academic theses13
- Monographs13
- Handbooks10
- periodicals9
- Formulae, receipts, prescriptions8
- Conference papers and proceedings6
- Examination Questions6
- Handbooks and manuals6