Research topics below this in the hierarchy
- Technology (General)
- Engineering (General)
- Hydraulic engineering. Ocean engineering
- Environmental technology. Sanitary engineering
- Highway engineering. Roads and pavements
- Railroad engineering and operation
- Bridge engineering
- Building construction
- Mechanical engineering and machinery
- Electrical engineering. Electronics. Nuclear engineering
- Motor vehicles. Aeronautics. Astronautics
- Mining engineering. Metallurgy
- Chemical technology
- Photography
- Manufactures
- Handicrafts. Arts and crafts
- House and home
- materials science
- Computer science
- Nanotechnology