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- Dewey Decimal Classification (DDC) (7)
- 300 Social sciences (7)
- 338 Production (7)
- 338.2 Extraction of minerals (7)
- 338.27 Products (7)
- 338.2 Extraction of minerals (7)
- 338 Production (7)
- 300 Social sciences (7)
Number of items at this level: 0.