SUBJECT
Agriculture
Economic aspects
20
Rice
8
Study and teaching
5
Agricultural education
4
Information services
4
Farm management
3
Mathematical models
3
Agricultural extension work
2
Cropping systems
2
Food supply
2
Irrigation
2
economic aspects
2
Advertising
1
Agricultural credit
1
Agricultural extension ork
1
Agricultural laborers
1
Agricultural machinery
1
Agricultural production
1
Agricultural societies
1
Agriculture and state
1
Agriculture teacher
1
Agriculture, Cooperative
1
Agriculturists
1
Amparai District
1
Bicol
1
Capitalism
1
Census, 1903
1
Communication in agriculture
1
Cost of operation
1
Crop yields
1
Curricula
1
Econ. condit
1
Education
1
Experimentation
1
Farm income
1
Farm mechanization
1
Farm produce
1
Farm tenancy
1
Farms, Size of
1
Fertilizers and manures
1
Land classification
1
Land reform
1
Landlord and tenant
1
Manobo tribe
1
Marketing
1
Mindanao
1
Natural resources
1
Nitrogen fertilizers
1
Physical geography
1
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