History 118 Design and construction 74 Problems, exercises, etc 68 methods 59 Editing 53 Diseases 51 Economic conditions 46 mere ... History and criticism 46 Management 46 therapy 43 Economic history 41 Commerce 39 diagnosis 36 Business enterprises 31 Politics and government 30 Engineering 29 Outlines, syllabi, etc 29 Edición 28 Surgery 27 Education 25 Philosophy 25 Probabilities 25 Stochastic processes 24 Purification 23 Medicine 22 Intellectual life 20 Quality control 20 Spanish literature 20 Diagnosis 19 Maintenance and repair 19 mindre ...