Self-help 182 Self help 123 Philosophy 120 Non Fiction 114 History 104 Selling 104 Quantum field theory 94 Computer simulation 88 Psychology 88 Agronomy 84 Self-actualization (Psychology) 83 Agriculture 74 Research 73 Field crops 67 Mathematics 66 Physics 66 Women 65 Self 58 Health, Mind & Body 57 History and criticism 55 Mathematical models 55 Field theory 53 Quantum theory 53 Social sciences 53 Self-realization 52 Success 52 Field Crops 51 Plant Breeding and Genetics 50 Biotechnology 47 Self Help 45