Classification
621 - Applied physics
658
620 - Engineering & allied operations
225
629 - Other branches of engineering
67
536 - Heat
64
660 - Chemical engineering
47
530 - Physics
42
333 - Economics of land & energy
32
006 - Special computer methods
15
670 - Manufacturing
15
531 - Classical mechanics; solid mechanics
14
541 - Physical chemistry
14
690 - Buildings
11
003 - Systems
8
624 - Civil engineering
8
696 - Utilities
8
720 - Architecture
8
519 - Probabilities & applied mathematics
5
628 - Sanitary & municipal engineering
5
697 - Heating, ventilating & air-conditioning
5
515 - Analysis
4
658 - General management
4
338 - Production
3
551 - Geology, hydrology & meteorology
3
662 - Explosives, fuels & related products
3
667 - Cleaning, color & coating technologies
3
691 - Building materials
3
352 - General considerations of public administration
2
543 - Analytical chemistry
2
550 - Earth sciences
2
004 - Data processing & computer science
1
321 - Systems of governments & states
1
330 - Economics
1
336 - Public finance
1
500 - Natural sciences & mathematics
1
510 - Mathematics
1
518 - Numerical analysis
1
520 - Astronomy & allied sciences
1
526 - Mathematical geography
1
534 - Sound & related vibrations
1
535 - Light & infrared & ultraviolet phenomena
1
538 - Magnetism
1
539 - Modern physics
1
571 - Physiology & related subjects
1
600 - Technology
1
610 - Medicine & health
1
616 - Diseases
1
627 - Hydraulic engineering
1
664 - Food technology
1