Classification
005 - Computer programming, programs & data
194
330 - Economics
192
616 - Diseases
192
620 - Engineering & allied operations
161
621 - Applied physics
140
004 - Data processing & computer science
116
006 - Special computer methods
115
519 - Probabilities & applied mathematics
111
530 - Physics
104
571 - Physiology & related subjects
81
610 - Medicine & health
79
658 - General management
75
515 - Analysis
69
612 - Human physiology
55
300 - Social sciences
52
500 - Natural sciences & mathematics
50
572 - Biochemistry
50
333 - Economics of land & energy
48
003 - Systems
46
001 - Knowledge
43
541 - Physical chemistry
43
570 - Life sciences; biology
38
577 - Ecology
38
539 - Modern physics
36
320 - Political science
35
615 - Pharmacology & therapeutics
33
331 - Labor economics
30
551 - Geology, hydrology & meteorology
28
531 - Classical mechanics; solid mechanics
27
617 - Surgery & related medical specialties
26
629 - Other branches of engineering
22
332 - Financial economics
21
510 - Mathematics
20
580 - Plants (Botany)
19
338 - Production
18
660 - Chemical engineering
18
670 - Manufacturing
18
518 - Numerical analysis
16
304 - Factors affecting social behavior
15
363 - Other social problems & services
14
579 - Microorganisms, fungi & algae
14
000 - Computer science, information & general works
13
512 - Algebra
13
520 - Astronomy & allied sciences
13
340 - Law
12
511 - General principles of mathematics
12
523 - Specific celestial bodies & phenomena
12
550 - Earth sciences
12
590 - Animals (Zoology)
12
630 - Agriculture & related technologies
12
more ...