SUBJECT
Economic aspects
Agriculture
15
Food supply
5
Agriculture and state
3
Environmental aspects
2
Food industry and trade
2
Forests and forestry
2
Political aspects
2
Produce trade
2
Addresses, essays, lectures
1
Agricultural development projects
1
Agroforestry
1
Children
1
Climatic changes
1
Control
1
Deforestation
1
Economic conditions
1
Economic policy
1
Economic sanctions
1
Food prices
1
Forecasting
1
Forest policy
1
Irrigation
1
Irrigation farming
1
Land
1
Nutrition
1
Peasantry
1
Persian Gulf War, 1991
1
Planning
1
Rural poor
1
Social aspects
1
Soils
1
Study and teaching
1
Water, Underground
1