History 144 Natural history 84 History and criticism 56 Philosophy 52 Natural history of animals 43 Science 38 Natural history-- India 32 Nature 32 Human ecology 29 Natural resources 26 Natural History 25 Nature in literature 21 Botany 17 English literature 17 Zoology 17 Technology 15 India 14 American literature 13 Ecology 13 Social aspects 13 exports 13 imports 13 Hortus Malabaricus 12 Plants Malabar 12 Politics and government 12 Feminism 11 Birds 10 Criticism 10 Historiography 10 Human rights 10