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Subclass TA
| TA1-2040 | Engineering (General). Civil engineering (General) | |
| TA164 | Bioengineering | |
| TA165 | Engineering instruments, meters, etc. Industrial instrumentation | |
| TA166-167 | Human engineering | |
| TA168 | Systems engineering | |
| TA170-171 | Environmental engineering | |
| TA174 | Engineering design | |
| TA177.4-185 | Engineering economy | |
| TA190-194 | Management of engineering works | |
| TA197-198 | Engineering meteorology | |
| TA213-215 | Engineering machinery, tools, and implements | |
| TA329-348 | Engineering mathematics. Engineering analysis | |
| TA349-359 | Mechanics of engineering. Applied mechanics | |
| TA365-367 | Acoustics in engineering. Acoustical engineering | |
| TA401-492 | Materials of engineering and construction. Mechanics of materials | |
| TA495 | Disasters and engineering | |
| TA501-625 | Surveying | |
| TA630-695 | Structural engineering (General) | |
| TA703-712 | Engineering geology. Rock mechanics. Soil mechanics. Underground construction | |
| TA715-787 | Earthwork. Foundations | |
| TA800-820 | Tunneling. Tunnels | |
| TA1001-1280 | Transportation engineering | |
| TA1501-1820 | Applied optics. Photonics | |
| TA2001-2040 | Plasma engineering. Applied plasma dynamics | |
