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- Labor and laboring classes-El Salvador- Political activity 1
- Labor and laboring classes-El Salvador-Economic aspects 1
- Labor and laboring classes-El Salvador-Political activity 1
- Labor and laboring classes-History 1
- Labor and laboring classes-Political activity-El Salvador 4
- Labor and laboring classes-Religious aspects 1
- Labor and laboring classes-Social conditions-El Salvador 1
- Labor contract-Law and legislation 1
- Labor discipline 1
- Labor disputes-Costa Rica 1
- Labor disputes-El Salvador 89
- Labor disputes-El Salvador-1983 1
- Labor disputes-El Salvador-1984 2
- Labor economics 1
- Labor law 1
- Labor mobility-Law and legislation-El Salvador 1
- Labor movement 1
- Labor movement-Venezuela 1
- Labor policy-El Salvador 8
- Labor policy-El Salvador-1988 1