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- Dewey Decimal Classification (DDC) (21)
- 600 Technology (Applied sciences) (21)
- 628 Sanitary engineering (21)
- 628.1 Water supply (21)
- 628.11 Sources (21)
- 628.1 Water supply (21)
- 628 Sanitary engineering (21)
- 600 Technology (Applied sciences) (21)
Number of items at this level: 0.