Physics 42 Research & information: general 15 Technology: general issues 9 Society & social sciences 5 Business & management 4 History 4 History of engineering & technology 4 Humanities 4 Law 4 linguistics 4 Anthropology 3 Asian history 3 Economics 3 Education 3 Educational strategies & policy 3 Geography 3 History of the Americas 3 Social & cultural anthropology, ethnography 3 Social & cultural history 3 Sociology 3 Architecture: professional practice 2 Biography: general 2 Central government policies 2 Criminal law & procedure 2 Curriculum planning & development 2 Ecological science, the Biosphere 2 Environmental monitoring 2 History of architecture 2 Human geography 2 Landscape art & architecture 2