• 10 Government, Political System
• 11 Political Institutions
• 12 International Institutions, Relations, Conditions
• 13 Political Ideology
• 14 Political Issues
• 15 Political Attitudes and Behavior
• 16 Political Parties, Organizations
• 17 Public Figures
• 19 Armed Forces, Defense, Military Affairs
• 20 Legal system, Legislation, Law
• 30 Economic Systems
• 31 Economic Policy, National Economic Situation
• 32 Social Policy
• 33 Budget and Fiscal Policy
• 34 Public Expenditures
• 35 Public Revenue
• 36 Branches of Economy, Services and Transport
• 37 Work and Industry
• 38 Occupation, Profession
• 39 Income
• 40 Patterns of Consumption
• 41 Saving, Investment of Money
• 42 Stock Market and Monetary Transactions
• 50 Society, Culture
• 51 Community, Living Environment
• 52 Group
• 53 Family
• 54 Person, Personality, Role
• 55 Education, School Systems
• 56 University, Research, the Sciences
• 57 Religion and Weltanschauung
• 58 Technology, Energy
• 59 Medicine
• 60 Leisure
• 62 Communication, Public Opinion, Media
• 65 Natural Environment, Nature
• 75 Historical Social Research
• 76 Historical Studies Data