History 15 Valence (Theoretical chemistry) 12 Feminism 11 Valences 10 Women 9 Criticism 8 Philosophy 8 VALENCY AND MOLECULAR STRUCTURE 7 Historiography 6 English literature 5 History and criticism 5 Literature 5 Feminist theory 4 Language 4 Molecular bonds 4 Political aspects 4 Sex role 4 Social Sciences 4 Social change 4 Study and teaching 4 Technological innovations 4 Valency 4 Women and literature 4 Biochemistry 3 Chemical bonds 3 Economic conditions 3 English poetry 3 Literature English 3 Molecular bonds and valances; Theoretical chemistry 3 Molecular structure 3