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- Dewey Decimal Classification (DDC) (13)
- 600 Technology (Applied sciences) (13)
- 633 Field and plantation crops (13)
- 633.1 Cereals (13)
- 633.15 Corn (13)
- 633.159 Corn (Injuries, diseases, pests) (13)
- 633.15 Corn (13)
- 633.1 Cereals (13)
- 633 Field and plantation crops (13)
- 600 Technology (Applied sciences) (13)
Number of items at this level: 0.