Dictionary 24 Dictionaries 21 Ecology 21 Clinical psychology 14 Psychology, Clinical 14 Econometrics-- Economics 13 Econometrics 12 Philosophy 7 Economics 5 Religion 5 Dictionary--Encyclopaedia--Handbook 4 Human geography 4 United States 4 Algebra 3 Biodiversity conservation 3 Drama 3 Elections 3 Geography 3 History 3 History and criticism 3 Immunochemistry 3 International agencies 3 Management 3 Marine ecology 3 Mass media 3 Social movements 3 Sociolinguistics 3 Sociology 3 Abstract algebra-- Mathematics 2 Algebra, Boolean 2