General 7 Social life and customs 5 Fourth dimension 4 Manners and customs 4 Mathematics 4 SOCIAL SCIENCE 4 African Americans 3 FICTION 3 History 3 Human Geography 3 Mœurs et coutumes 3 Authors, American 2 BIOGRAPHY & AUTOBIOGRAPHY 2 City planning 2 Discrimination 2 Folklore 2 Food consumption 2 History and criticism 2 Human geography 2 Hyperspace 2 LITERARY CRITICISM 2 Landscape/Regional and Urban Planning 2 Landscapes 2 Legends 2 Literary 2 Minorities 2 Nutrition 2 Philosophy 2 Physics 2 Poor 2