Catalog Index By LC Categories
- T - Technology (General)
- TA - Engineering Civil engineering (General).
- TC - Hydraulic engineering. Ocean engineering
- TD - Environmental technology. Sanitary engineering
- TE - Highway engineering. Roads and pavements
- TF - Railroad engineering and operation
- TG - Bridges
- TH - Building construction
- TJ - Mechanical engineering and machinery
- TK - Electrical engineering. Electronics. Nuclear engineering
- TL - Motor vehicles. Aeronautics. Astronautics
- TN - Mining engineering. Metallurgy
- TP - Chemical technology
- TR - Photography
- TS - Manufacturing engineering. Mass production
- TT - Handicrafts. Arts and crafts
- TX - Home economics