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- Dewey Decimal Classification (DDC) (9)
- 600 Technology (Applied sciences) (9)
- 662 Explosives of explosives, fuels, related products (9)
- 662.6 Fuels (9)
- 662.66 Synthetic fuels (9)
- 662.6 Fuels (9)
- 662 Explosives of explosives, fuels, related products (9)
- 600 Technology (Applied sciences) (9)
Number of items at this level: 0.