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- Dewey Decimal Classification (DDC) (18)
- 300 Social sciences (18)
- 338 Production (18)
- 338.5 General production economics (18)
- 338.54 Economic fluctuations (18)
- 338.5 General production economics (18)
- 338 Production (18)
- 300 Social sciences (18)
Number of items at this level: 0.