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- Dewey Decimal Classification (DDC) (11)
- 300 Social sciences (11)
- 344 Labor, social service, education, cultural law (11)
- 344.04 Miscellaneous social problems and services (11)
- 344.046 Environmental protection (11)
- 344.046 3 Pollution and noise (11)
- 344.046 Environmental protection (11)
- 344.04 Miscellaneous social problems and services (11)
- 344 Labor, social service, education, cultural law (11)
- 300 Social sciences (11)
Number of items at this level: 0.