History 35 Enzymes 17 Politics and government 14 Motion pictures 9 Biochemistry 8 Social aspects 8 Social conditions 8 Women 8 Autobiography 6 Biography 6 Education 6 Philosophy 6 History and criticism 5 Literature 5 Economics 4 Enzymatic analysis 4 Feminists 4 World War, 1939-1945 4 Algebra, Universal 3 Algebraic logic 3 Arts 3 Books and reading 3 Cinema 3 Constitutional history 3 Economic development 3 Education and state 3 English fiction 3 Enzymes-analysis 3 Feminism 3 Fiction 3