Classification
620 - Engineering & allied operations
6,349
621 - Applied physics
3,565
005 - Computer programming, programs & data
1,665
004 - Data processing & computer science
1,131
629 - Other branches of engineering
1,104
624 - Civil engineering
715
519 - Probabilities & applied mathematics
690
670 - Manufacturing
624
658 - General management
522
006 - Special computer methods
504
003 - Systems
493
660 - Chemical engineering
366
530 - Physics
314
531 - Classical mechanics; solid mechanics
258
690 - Buildings
204
515 - Analysis
173
551 - Geology, hydrology & meteorology
161
610 - Medicine & health
146
363 - Other social problems & services
123
541 - Physical chemistry
96
518 - Numerical analysis
90
616 - Diseases
86
628 - Sanitary & municipal engineering
83
333 - Economics of land & energy
82
650 - Management & auxiliary services
82
536 - Heat
66
539 - Modern physics
66
677 - Textiles
63
338 - Production
62
534 - Sound & related vibrations
62
550 - Earth sciences
60
330 - Economics
59
537 - Electricity & electronics
58
520 - Astronomy & allied sciences
56
512 - Algebra
55
910 - Geography & travel
54
511 - General principles of mathematics
51
540 - Chemistry & allied sciences
48
510 - Mathematics
45
543 - Analytical chemistry
44
571 - Physiology & related subjects
44
500 - Natural sciences & mathematics
40
577 - Ecology
39
617 - Surgery & related medical specialties
37
516 - Geometry
29
570 - Life sciences; biology
29
535 - Light & infrared & ultraviolet phenomena
27
523 - Specific celestial bodies & phenomena
23
509 - Historical, geographic & persons treatment
22
572 - Biochemistry
20
more ...