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- Natural resources15
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- Pollution13
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- Local government --Economic aspects9
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- Environment7
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- Agriculture3
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- Agriculture--Handbooks, manuals, etc.1
- Animal rights1
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- Civil rights1
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- Education14
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- Environment7
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- Books and reading4
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- Renewable energy resources2
- Schools2
- Science and technology2
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- Adult education1
- Advertising1
- Agricultural development projects1
- Agricultural laws and legislation1
- Agriculture and politics1
- Archaeology1
- Architecture1
- Business1
- Child welfare1
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- Commerce1
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- Education and state1
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- Environment9
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- Urban policy--Environmental aspects4
- Natural disasters3
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- Community development2
- Energy policy2
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- Ecology1
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- Energy policy9
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- Energy6
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