Classification
330 - Economics
109
006 - Special computer methods
81
610 - Medicine & health
55
519 - Probabilities & applied mathematics
34
620 - Engineering & allied operations
34
621 - Applied physics
32
004 - Data processing & computer science
30
333 - Economics of land & energy
29
515 - Analysis
28
551 - Geology, hydrology & meteorology
24
658 - General management
23
616 - Diseases
21
700 - The arts; fine & decorative arts
21
363 - Other social problems & services
20
000 - Computer science, information & general works
19
523 - Specific celestial bodies & phenomena
18
530 - Physics
18
580 - Plants (Botany)
17
500 - Natural sciences & mathematics
16
550 - Earth sciences
16
600 - Technology
16
005 - Computer programming, programs & data
15
900 - History & geography
15
577 - Ecology
14
300 - Social sciences
12
617 - Surgery & related medical specialties
12
001 - Knowledge
11
003 - Systems
10
520 - Astronomy & allied sciences
10
380 - Commerce, communications & transportation
8
511 - General principles of mathematics
8
571 - Physiology & related subjects
8
576 - Genetics & evolution
8
612 - Human physiology
8
304 - Factors affecting social behavior
7
510 - Mathematics
7
570 - Life sciences; biology
7
572 - Biochemistry
7
332 - Financial economics
6
338 - Production
6
539 - Modern physics
6
629 - Other branches of engineering
6
670 - Manufacturing
6
541 - Physical chemistry
5
630 - Agriculture & related technologies
5
910 - Geography & travel
5
340 - Law
4
370 - Education
4
516 - Geometry
4
518 - Numerical analysis
4
more ...