History of engineering & technology Management of specific areas Energy industries & utilities 8 Coins, banknotes, medals, seals (numismatics) 7 Biochemical engineering 6 Manufacturing industries 4 Pharmaceutical industries 4 Earth sciences, geography, environment, planning 3 Engineering: general 3 Information technology industries 3 Environmental economics 2 Food manufacturing & related industries 2 Business strategy 1 Conservation of buildings & building materials 1 Ecological science, the Biosphere 1 Medical equipment & techniques 1 Natural disasters 1 Technology: general issues 1