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- Dewey Decimal Classification (DDC) (2)
- 300 Social sciences (2)
- 333 Economics of land and energy (2)
- 333.9 Other natural resources (2)
- 333.91 Water and lands adjoining bodies of water (2)
- 333.916 Specific bodies of water (2)
- 333.91 Water and lands adjoining bodies of water (2)
- 333.9 Other natural resources (2)
- 333 Economics of land and energy (2)
- 300 Social sciences (2)
Number of items at this level: 0.