Classification
620 - Engineering & allied operations
6,429
621 - Applied physics
3,607
005 - Computer programming, programs & data
1,735
629 - Other branches of engineering
1,120
004 - Data processing & computer science
1,064
624 - Civil engineering
715
670 - Manufacturing
644
519 - Probabilities & applied mathematics
619
658 - General management
518
006 - Special computer methods
504
003 - Systems
500
660 - Chemical engineering
319
530 - Physics
307
531 - Classical mechanics; solid mechanics
256
690 - Buildings
195
551 - Geology, hydrology & meteorology
166
515 - Analysis
163
610 - Medicine & health
147
363 - Other social problems & services
115
333 - Economics of land & energy
92
518 - Numerical analysis
87
616 - Diseases
87
541 - Physical chemistry
85
628 - Sanitary & municipal engineering
79
539 - Modern physics
74
536 - Heat
66
330 - Economics
63
534 - Sound & related vibrations
63
650 - Management & auxiliary services
61
677 - Textiles
60
338 - Production
59
550 - Earth sciences
59
537 - Electricity & electronics
58
520 - Astronomy & allied sciences
55
910 - Geography & travel
55
512 - Algebra
52
510 - Mathematics
49
511 - General principles of mathematics
48
540 - Chemistry & allied sciences
46
500 - Natural sciences & mathematics
45
543 - Analytical chemistry
43
571 - Physiology & related subjects
42
577 - Ecology
40
617 - Surgery & related medical specialties
37
570 - Life sciences; biology
27
516 - Geometry
25
523 - Specific celestial bodies & phenomena
24
509 - Historical, geographic & persons treatment
22
720 - Architecture
22
612 - Human physiology
19
more ...