Military art and science -- 4 History -- 3 Economic conditions -- 2 Environmental indicators -- 2 Health status indicators -- 2 Science -- 2 Science indicators -- 2 more ... Social conditions -- 2 Civilization 1 Collective farms -- 1 Communes (China) 1 Communism -- 1 Congresses -- 1 Defenses -- 1 Early works to 1800 -- 1 Economic policy -- 1 Elite (Social sciences) -- 1 Forecasting 1 Forecasting -- 1 Government policy -- 1 Grain trade -- 1 Local government -- 1 Management 1 Peasantry -- 1 Political culture -- 1 Political leadership -- 1 Political parties -- 1 Political science 1 Political science -- 1 Politics and government -- 1 less ...