Plasma (Ionized gases) 64 History 36 English literature 23 Indo- Iranian Journal 22 Literature 20 Novel 20 Dissertations, Academic (Ph.D) 19 History and criticism 15 Chemistry 14 Physical chemistry 14 Catalysis 13 Ionized gases 13 Ionisation 12 Iron 12 Ionizing radiation 11 Irony in literature 11 Mass media 11 Criticism 10 Iron age 10 Motion pictures 10 Physics 10 Plasma physics; Properties of matter 10 Radiation 10 Social aspects 10 Isotopes 9 Philosophy 9 English fiction 8 Ionic solutions 8 Nanotechnology 8 Criticism and interpretation 7