History 42 Arts 13 Politics and government 13 cytology 12 Italy 11 Renaissance 10 CARYOLOGIA : International journal of cytology cytosystematics and cytogenetics 9 Communism 8 Congresses 8 Literature 8 Philosophy 8 History Italy 6 History and criticism 6 Astronomers 5 Biography 5 Biotechnology 5 Intellectual life 5 Literature English 5 Political aspects 5 Agriculture 4 American fiction 4 Art 4 Biotechnology (General), (Revised June 2002) 4 Civilization 4 Drama 4 Fiction 4 Influence 4 Mathematical models 4 Mathematicians 4 Plants 4