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Subject (Genre)
- Periodicals107
- Electronic books34
- Early works to 18009
- Periodical5
- Problems, exercises, etc5
- Textbooks5
- Early works to 19004
- Congresses3
- Early works3
- Tables3
- Bibliography2
- History2
- Statistics2
- Conference papers and proceedings1
- Dictionaries1
- Documentary films1
- Encyclopedias1
- Formulae1
- Historical Works1
- Nonfiction films1