International relations 7 Science: general issues 6 Military history 4 Botany & plant sciences 3 Defence strategy, planning & research 3 Espionage & secret services 3 History of engineering & technology 3 Media studies 3 Medical ethics & professional conduct 3 Medicine 3 Politics & government 3 Terrorism, armed struggle 3 Urban & municipal planning 3 Warfare & defence 3 Archaeology 2 Coins, banknotes, medals, seals (numismatics) 2 Education 2 Energy industries & utilities 2 Higher & further education, tertiary education 2 History of science 2 History of the Americas 2 Human rights 2 Literary studies: classical, early & medieval 2 Literature: history & criticism 2 Neurosciences 2 Oceanography (seas) 2 Psychiatry 2 Public health & preventive medicine 2 Research & information: general 2 Service industries 2