Subject
Desertification
2
Green products
2
Human ecology
2
Organic living
2
Social aspects
2
Ecology
1
Education-Research
1
Effect of human beings on
1
Handbook, manual, etc
1
Human - animal relationship
1
Human - plant relationship
1
Human geography
1
Landscape assessement Landscape protection Envioranmental impact analysis
1
Material culture
1
Nature
1
New products
1
Survival skills
1