Classification
005 - Computer programming, programs & data
94
006 - Special computer methods
94
620 - Engineering & allied operations
74
519 - Probabilities & applied mathematics
72
004 - Data processing & computer science
71
621 - Applied physics
47
515 - Analysis
44
500 - Natural sciences & mathematics
38
003 - Systems
33
530 - Physics
29
040 - [Unassigned]
28
658 - General management
21
300 - Social sciences
20
518 - Numerical analysis
19
330 - Economics
17
001 - Knowledge
16
531 - Classical mechanics; solid mechanics
12
610 - Medicine & health
12
510 - Mathematics
11
551 - Geology, hydrology & meteorology
10
670 - Manufacturing
8
570 - Life sciences; biology
7
629 - Other branches of engineering
7
331 - Labor economics
6
512 - Algebra
6
333 - Economics of land & energy
5
550 - Earth sciences
5
624 - Civil engineering
5
660 - Chemical engineering
5
025 - Library operations
4
302 - Social interaction
4
371 - Schools & their activities; special education
4
511 - General principles of mathematics
4
536 - Heat
4
539 - Modern physics
4
616 - Diseases
4
381 - Commerce
3
541 - Physical chemistry
3
549 - Mineralogy
3
572 - Biochemistry
3
000 - Computer science, information & general works
2
301 - Sociology & anthropology
2
332 - Financial economics
2
370 - Education
2
418 - Standard usage & applied linguistics
2
516 - Geometry
2
537 - Electricity & electronics
2
547 - Organic chemistry
2
577 - Ecology
2
580 - Plants (Botany)
2
more ...