Social sciences 666 Research 273 History 261 Methodology 213 Politics and government 187 Philosophy 104 Policy sciences 103 更多 ... Periodicals 63 Speeches, addresses, etc., American 63 Economics 52 Economic conditions 45 Evaluation research (Social action programs) 45 International relations 43 Social conditions 41 Sociology 38 Foreign relations 37 Political science 29 Mathematical models 28 Study and teaching 28 Statistical methods 22 Finance 21 Commerce 19 Economic aspects 18 Fieldwork 18 Social scientists 18 Colonies 17 Evaluation 17 Economic policy 16 Interviewing 16 Qualitative research 16 少 ...