History 6 History and criticism 5 Operas 5 Madrigals, Italian 4 SOCIAL SCIENCE 4 Anthropology 3 Bills, Private 3 Biomedicine 3 Claims 3 Cultural 3 Indians of North America 3 Medicine 3 Pollution 3 Religious aspects 3 Social aspects 3 Adaptation (Biology) 2 American poetry 2 Astronomy 2 Cantatas, Secular 2 Christianity 2 Civilization 2 Ecology 2 Economic aspects 2 Economics 2 Ecotoxicology 2 Education (Higher) 2 English literature 2 Environment 2 Environmental toxicology 2 Euthenics 2