Classification
621 - Applied physics
684
620 - Engineering & allied operations
239
629 - Other branches of engineering
68
536 - Heat
64
660 - Chemical engineering
47
530 - Physics
44
333 - Economics of land & energy
35
670 - Manufacturing
19
541 - Physical chemistry
15
531 - Classical mechanics; solid mechanics
12
690 - Buildings
11
003 - Systems
8
624 - Civil engineering
8
696 - Utilities
8
720 - Architecture
8
006 - Special computer methods
5
519 - Probabilities & applied mathematics
5
600 - Technology
5
628 - Sanitary & municipal engineering
5
697 - Heating, ventilating & air-conditioning
5
000 - Computer science, information & general works
4
515 - Analysis
4
658 - General management
4
338 - Production
3
551 - Geology, hydrology & meteorology
3
667 - Cleaning, color & coating technologies
3
691 - Building materials
3
900 - History & geography
3
330 - Economics
2
340 - Law
2
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
336 - Public finance
1
380 - Commerce, communications & transportation
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
540 - Chemistry & allied sciences
1
571 - Physiology & related subjects
1
576 - Genetics & evolution
1
610 - Medicine & health
1
more ...