54 Foreign relations 43 History 36 Commerce 26 Politics and government 25 Sources 23 Law and legislation 19 Economic policy 14 Economic conditions 14 Land tenure 13 Education 12 Local government 11 Transportation 10 Land use 9 Administrative law 9 Finance, Public 9 Public administration 8 Postal service 8 Tariff 7 Civil service 6 Adult education 6 Cooperation 6 Curricula 6 Food supply 6 Geology 6 Law 6 Railroads 5 Debts, Public 5 Drug control 5 Industries 5 Mines and mineral resources