History of engineering and technology 536 Technology: general issues 531 TA Engineering (General). Civil engineering (General) 484 TJ Mechanical engineering and machinery 442 TK Electrical engineering. Electronics Nuclear engineering 279 Materials science 238 Mechanical engineering & materials 150 History of engineering & technology 148 Research & information: general 98 Industrial chemistry and chemical engineering 56 Civil engineering, surveying & building 53 Building construction & materials 49 Chemistry 47 Biotechnology 41 Biology, life sciences 38 Electrical engineering 37 Mechanical engineering 36 Biomedical engineering 35 Mechanical engineering and materials 35 Environmental science, engineering and technology 34 Physics 34 Environmental science, engineering & technology 33 Compressive strength 32 Engineering: general 32 T Technology (General) 31 Energy technology & engineering 30 TP Chemical technology 30 Finite element method 27 Nanostructured materials 25 Materials of engineering and construction 23