Classification
621 - Applied physics
5,463
005 - Computer programming, programs & data
3,889
620 - Engineering & allied operations
3,401
004 - Data processing & computer science
2,955
006 - Special computer methods
2,836
629 - Other branches of engineering
2,373
003 - Systems
1,074
610 - Medicine & health
840
624 - Civil engineering
742
670 - Manufacturing
728
519 - Probabilities & applied mathematics
597
658 - General management
522
660 - Chemical engineering
451
530 - Physics
433
333 - Economics of land & energy
314
515 - Analysis
298
518 - Numerical analysis
289
571 - Physiology & related subjects
283
551 - Geology, hydrology & meteorology
267
628 - Sanitary & municipal engineering
239
690 - Buildings
238
531 - Classical mechanics; solid mechanics
193
550 - Earth sciences
173
363 - Other social problems & services
172
616 - Diseases
141
520 - Astronomy & allied sciences
137
612 - Human physiology
115
304 - Factors affecting social behavior
100
570 - Life sciences; biology
100
691 - Building materials
99
500 - Natural sciences & mathematics
97
338 - Production
96
537 - Electricity & electronics
92
541 - Physical chemistry
89
579 - Microorganisms, fungi & algae
87
910 - Geography & travel
80
539 - Modern physics
77
332 - Financial economics
64
303 - Social processes
62
535 - Light & infrared & ultraviolet phenomena
62
330 - Economics
61
720 - Architecture
60
664 - Food technology
59
534 - Sound & related vibrations
58
371 - Schools & their activities; special education
55
627 - Hydraulic engineering
53
321 - Systems of governments & states
47
543 - Analytical chemistry
46
536 - Heat
45
630 - Agriculture & related technologies
43
more ...