SUBJECT
Rice
12
Education
9
Population
9
Congresses
8
Social aspects
6
Economic aspects
5
History
5
Natural resources
5
Education and state
3
Mathematics
3
Research
3
Social conditions
3
Adult education
2
Authorship
2
Birth control
2
Children
2
Economic conditions
2
Economic development
2
Economic history
2
Educational change
2
Educational innovations
2
Energy policy
2
Evaluation
2
Filipino language
2
Food supply
2
Forecasting
2
Health and hygiene
2
Human capital
2
Law and legislation
2
Management
2
Planting
2
Population policy
2
Power resources
2
Quality of life
2
Rice research
2
Social sciences
2
Sustainable development
2
Underdeveloped areas
2
Addresses, essays, lectures
1
Agricultural chemistry
1
Agricultural innovations
1
Agricultural machinery
1
Agriculture
1
Algebra
1
Animal breeding
1
Animal genetics
1
Appropriations and expenditures
1
Awards
1
Azolla
1
Basic education
1
mehr ...