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Current results range from 1968 to 2023
- Puerto Rico✖[remover]52
- Environment and ecology52
- Environmental protection10
- Environmental education9
- Sustainable development7
- Natural disasters6
- Community development--Environmental aspects5
- Conservation of natural resources5
- Water use5
- Community development4
- Festivals4
- Architecture3
- Ecotourism3
- Environmental policy3
- Environmentalism3
- Forests and forestry3
- Marine resources3
- Natural resources3
- Nature conservation3
- Pollution3
- Social policy--Citizen participation3
- Water resources3
- Books and reading2
- Disaster planning and relief2
- Ecology2
- Land use, urban2
- Recycling (Waste, etc.); Waste disposal2
- Renewable energy resources2
- Universities and colleges2
- Wildlife conservation2
- Youth2
- Advertising--Tourism1
- Agricultural exhibitions1
- Building1
- Children1
- Children's rights1
- Citizen participation1
- City planning1
- Civil society1
- Climate change1
- Culture1
- Documentary films1
- Education1
- Education--Study and teaching1
- Energy Technology1
- Energy policy1
- Environment1
- Health1
- History1
- Income distribution1
- Intellectuals1
- Labor1
- Literature1
- Motion pictures1
- Music1
- Nationalism1
- Oil industries1
- Popular culture1
- Public safety1
- Revolutions1
- Science and technology1
- Science education1
- Social conditions1
- Technical assistance1
- Urban policy--Environmental aspects1
- Arts and culture12
- Festivals4
- Architecture3
- Books and reading2
- Environmentalism2
- Natural disasters2
- Sustainable development2
- Children's rights1
- City planning1
- Conservation of natural resources1
- Culture1
- Documentary films1
- Ecology1
- Education--Study and teaching1
- Energy policy1
- Environmental protection1
- History1
- Intellectuals1
- Land use, urban1
- Literature1
- Marine resources1
- Motion pictures1
- Music1
- Nationalism1
- Natural resources1
- Nature conservation1
- Popular culture1
- Recycling (Waste, etc.); Waste disposal1
- Revolutions1
- Water resources1
- Water use1
- Wildlife conservation1
- Youth1
- Socioeconomic conditions and development6
- Education5
- Politics and government5
- Children and youth3
- Urban issues3
- Agrarian and rural issues1
- Economics1
- Health1
- History1
- Labor1
- Science and Technology1
- Tourism1