Research & information: general 66 Environmental science, engineering & technology 14 Slovenia 13 Biology, life sciences 11 History of engineering & technology 11 Technology: general issues 11 Archaeology 9 Environmental economics 9 Environmental management 8 European history 7 History 7 Ecological science, the Biosphere 6 Geography 6 Human geography 6 Hydrology & the hydrosphere 6 Social & cultural anthropology, ethnography 6 Anthropology 5 Applied ecology 5 Conservation of the environment 5 Geological surface processes (geomorphology) 5 Pollution & threats to the environment 5 Water supply & treatment 5 linguistics 5 History of the Americas 4 History: specific events & topics 4 Oceanography (seas) 4 Physical geography & topography 4 Prehistoric archaeology 4 Regional geography 4 Society & social sciences 4