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HISTORY POLITICS AND GOVERNMENT 47 LABOR UNIONS 15 SCIENCE 14 POLITICAL ACTIVITY 13 ECONOMIC CONDITIONS 7 POLITICAL PARTIES 7 SCIENCE, ANCIENT 7 SOCIALISM 7 WORKING CLASS 7 INTELLECTUAL LIFE 6 LABOR MOVEMENT 6 AGRICULTURE AND STATE 5 EDUCATION 5 HISTORIA 5 ARMED FORCES 4 COMMUNISM 4 MILITARY GOVERNMENT 4 PERONISM 4 SYNDICALISM 4 AGRICULTURAL LABORERS 3 CATHOLIC CHURCH 3 CHURCH AND SOCIAL PROBLEMS 3 CITIES AND TOWNS 3 COLLEGE STUDENTS 3 GOVERNMENT POLICY 3 HISTORIOGRAPHY 3 INDUSTRIAL POLICY 3 PETROLEUM INDUSTRY AND TRADE 3 RURAL CONDITIONS 3