Africans 6 History 5 Physics 4 Political aspects 4 Postcolonialism 4 Race 4 Relations 4 Time-series analysis 4 African Americans 3 Agricultural chemistry 3 Biodiversity 3 Criminal procedure (International law) 3 Econometrics 3 Economic development 3 Globalization 3 History and criticism 3 Plants 3 Slavery 3 South Africans 3 Africa 2 African diaspora 2 Art, African 2 Art, Modern 2 Autobiography 2 Botanical literature 2 Botany 2 Christianity 2 Community development 2 Counseling psychology 2 Ecology 2