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- Agricultural productivity 6
- Agricultural productivity-Central America 1
- Agricultural productivity-El Salvador 6
- Agricultural productivity-Guatemala 2
- Agricultural productivity-United States 3
- Agricultural resources 2
- Agricultural wages 1
- Agricultural wages-El Salvador 1
- Agricultural wastes 1
- Agriculture 10
- Agriculture and state-El Salvador 1
- Agriculture and state-El Salvador-2004 1
- Agriculture, cooperative 1
- Agriculture, cooperative-El Salvador 2
- Agriculture-Central America 1
- Agriculture-Economic aspects 2
- Agriculture-Economic aspects-El Salvador 6
- Agriculture-Economic aspects-Estados Unidos 1
- Agriculture-Economic aspects-Latin America 1
- Agriculture-El Salvador 13