History 33 Politics and government 12 Economic conditions 7 Agriculture 6 Foreign relations 6 Land tenure 6 Social conditions 6 Working class 6 Collections 5 Congresses 5 Constitutional history 4 Economic aspects 4 Indians of Mexico 4 Motion pictures 4 National characteristics, Mexican 4 Social life and customs 4 Bibliography 3 Biography 3 Economic policy 3 Labor unions 3 Spanish language 3 Agriculture and state 2 Architecture 2 Aztecs 2 Cooking, Mexican 2 Coplas 2 Emigration and immigration 2 Federal government 2 Finance 2 Folk art 2