Research & information: general 51 Geographical information systems (GIS) & remote sensing 10 Geography 10 History of engineering & technology 10 Technology: general issues 9 Other technologies & applied sciences 8 Environmental economics 7 Mobile phone technology 6 Biology, life sciences 5 Earth sciences 5 Climate change 4 Science: general issues 4 Engineering: general 3 Environmental science, engineering & technology 3 Humanities 3 Medicine 3 Social interaction 3 Astronautics 2 Astronomy, space & time 2 Communication studies 2 Computing & information technology 2 Conservation of the environment 2 Databases 2 Forestry & silviculture: practice & techniques 2 Geological surface processes (geomorphology) 2 Impact of science & technology on society 2 International relations 2 Literary studies: general 2 Physical geography & topography 2 Politics & government 2