Classification
515 - Analysis
910
620 - Engineering & allied operations
500
530 - Physics
418
629 - Other branches of engineering
389
003 - Systems
341
006 - Special computer methods
316
621 - Applied physics
293
519 - Probabilities & applied mathematics
275
004 - Data processing & computer science
210
005 - Computer programming, programs & data
132
510 - Mathematics
125
531 - Classical mechanics; solid mechanics
89
330 - Economics
87
512 - Algebra
84
658 - General management
72
500 - Natural sciences & mathematics
67
511 - General principles of mathematics
65
514 - Topology
63
518 - Numerical analysis
56
516 - Geometry
50
570 - Life sciences; biology
50
535 - Light & infrared & ultraviolet phenomena
46
540 - Chemistry & allied sciences
44
000 - Computer science, information & general works
41
536 - Heat
40
700 - The arts; fine & decorative arts
35
520 - Astronomy & allied sciences
34
300 - Social sciences
32
600 - Technology
31
670 - Manufacturing
31
333 - Economics of land & energy
28
001 - Knowledge
25
551 - Geology, hydrology & meteorology
25
571 - Physiology & related subjects
21
624 - Civil engineering
19
523 - Specific celestial bodies & phenomena
18
534 - Sound & related vibrations
18
541 - Physical chemistry
18
612 - Human physiology
17
338 - Production
16
610 - Medicine & health
16
576 - Genetics & evolution
15
690 - Buildings
15
900 - History & geography
15
577 - Ecology
14
550 - Earth sciences
12
539 - Modern physics
11
363 - Other social problems & services
10
331 - Labor economics
9
660 - Chemical engineering
9
more ...