History 299 Historia 209 City planning 115 Politics and government 95 Cities and towns 70 Urbanismo 67 Law and legislation 66 Foreign relations 60 Zeitschrift 56 Social aspects 53 Law 52 Droit 49 Social conditions 48 Relations 46 City planning and redevelopment law 45 Economic conditions 45 Education 45 Política y gobierno 43 Study and teaching 41 Research 37 Medicine 34 Emigration and immigration 33 Philosophy 33 Relaciones exteriores 31 Pe ́riodiques 28 Aspectos sociales 27 Histoire 27 Legal status, laws, etc 26 Libros electrónicos 26 Urbanization 26