Classification
629 - Other branches of engineering
1,234
621 - Applied physics
301
620 - Engineering & allied operations
202
003 - Systems
62
531 - Classical mechanics; solid mechanics
48
670 - Manufacturing
37
658 - General management
34
004 - Data processing & computer science
25
520 - Astronomy & allied sciences
22
005 - Computer programming, programs & data
21
624 - Civil engineering
19
006 - Special computer methods
18
330 - Economics
17
338 - Production
16
660 - Chemical engineering
15
519 - Probabilities & applied mathematics
13
690 - Buildings
11
333 - Economics of land & energy
9
500 - Natural sciences & mathematics
9
530 - Physics
9
610 - Medicine & health
8
363 - Other social problems & services
6
523 - Specific celestial bodies & phenomena
6
307 - Communities
5
515 - Analysis
5
650 - Management & auxiliary services
5
550 - Earth sciences
4
667 - Cleaning, color & coating technologies
4
303 - Social processes
3
304 - Factors affecting social behavior
3
518 - Numerical analysis
3
534 - Sound & related vibrations
3
536 - Heat
3
551 - Geology, hydrology & meteorology
3
910 - Geography & travel
3
370 - Education
2
509 - Historical, geographic & persons treatment
2
541 - Physical chemistry
2
600 - Technology
2
617 - Surgery & related medical specialties
2
710 - Civic & landscape art
2
150 - Psychology
1
158 - Applied psychology
1
300 - Social sciences
1
321 - Systems of governments & states
1
337 - International economics
1
341 - Law of nations
1
342 - Constitutional & administrative law
1
345 - Criminal law
1
362 - Social welfare problems & services
1
more ...