Classification
515 - Analysis
333
620 - Engineering & allied operations
244
621 - Applied physics
237
005 - Computer programming, programs & data
220
519 - Probabilities & applied mathematics
209
006 - Special computer methods
203
616 - Diseases
185
004 - Data processing & computer science
163
330 - Economics
150
530 - Physics
105
658 - General management
95
571 - Physiology & related subjects
89
610 - Medicine & health
79
003 - Systems
68
572 - Biochemistry
65
512 - Algebra
64
577 - Ecology
64
510 - Mathematics
61
500 - Natural sciences & mathematics
59
518 - Numerical analysis
57
300 - Social sciences
55
612 - Human physiology
54
629 - Other branches of engineering
49
511 - General principles of mathematics
44
001 - Knowledge
43
670 - Manufacturing
43
570 - Life sciences; biology
41
617 - Surgery & related medical specialties
38
531 - Classical mechanics; solid mechanics
34
333 - Economics of land & energy
33
338 - Production
30
331 - Labor economics
25
541 - Physical chemistry
25
580 - Plants (Botany)
24
332 - Financial economics
23
551 - Geology, hydrology & meteorology
23
660 - Chemical engineering
23
630 - Agriculture & related technologies
22
539 - Modern physics
21
615 - Pharmacology & therapeutics
21
516 - Geometry
20
514 - Topology
18
624 - Civil engineering
17
363 - Other social problems & services
16
550 - Earth sciences
16
618 - Gynecology, obstetrics, pediatrics & geriatrics
16
664 - Food technology
16
304 - Factors affecting social behavior
15
384 - Communications; telecommunication
15
579 - Microorganisms, fungi & algae
15
more ...