Classification
621 - Applied physics
1,914
620 - Engineering & allied operations
209
629 - Other branches of engineering
126
530 - Physics
68
004 - Data processing & computer science
63
003 - Systems
47
537 - Electricity & electronics
45
005 - Computer programming, programs & data
37
006 - Special computer methods
30
610 - Medicine & health
19
660 - Chemical engineering
19
670 - Manufacturing
19
539 - Modern physics
14
541 - Physical chemistry
12
658 - General management
11
515 - Analysis
9
535 - Light & infrared & ultraviolet phenomena
9
500 - Natural sciences & mathematics
7
538 - Magnetism
7
543 - Analytical chemistry
6
519 - Probabilities & applied mathematics
5
520 - Astronomy & allied sciences
5
363 - Other social problems & services
4
548 - Crystallography
4
628 - Sanitary & municipal engineering
4
321 - Systems of governments & states
3
333 - Economics of land & energy
3
518 - Numerical analysis
3
531 - Classical mechanics; solid mechanics
3
534 - Sound & related vibrations
3
536 - Heat
3
550 - Earth sciences
3
551 - Geology, hydrology & meteorology
3
910 - Geography & travel
3
509 - Historical, geographic & persons treatment
2
302 - Social interaction
1
338 - Production
1
345 - Criminal law
1
370 - Education
1
371 - Schools & their activities; special education
1
516 - Geometry
1
523 - Specific celestial bodies & phenomena
1
526 - Mathematical geography
1
540 - Chemistry & allied sciences
1
546 - Inorganic chemistry
1
577 - Ecology
1
600 - Technology
1
617 - Surgery & related medical specialties
1
624 - Civil engineering
1
693 - Specific materials & purposes
1