Classification
515 - Analysis
592
620 - Engineering & allied operations
300
629 - Other branches of engineering
265
003 - Systems
232
530 - Physics
225
621 - Applied physics
195
006 - Special computer methods
178
519 - Probabilities & applied mathematics
139
004 - Data processing & computer science
112
005 - Computer programming, programs & data
59
512 - Algebra
44
535 - Light & infrared & ultraviolet phenomena
43
531 - Classical mechanics; solid mechanics
42
570 - Life sciences; biology
40
511 - General principles of mathematics
38
516 - Geometry
28
518 - Numerical analysis
28
658 - General management
24
510 - Mathematics
22
514 - Topology
17
330 - Economics
12
690 - Buildings
12
523 - Specific celestial bodies & phenomena
11
536 - Heat
11
333 - Economics of land & energy
10
534 - Sound & related vibrations
10
571 - Physiology & related subjects
10
500 - Natural sciences & mathematics
9
670 - Manufacturing
9
300 - Social sciences
8
520 - Astronomy & allied sciences
8
551 - Geology, hydrology & meteorology
8
577 - Ecology
8
612 - Human physiology
8
624 - Civil engineering
8
301 - Sociology & anthropology
7
610 - Medicine & health
7
304 - Factors affecting social behavior
6
910 - Geography & travel
6
303 - Social processes
5
539 - Modern physics
5
541 - Physical chemistry
5
660 - Chemical engineering
5
338 - Production
4
501 - Philosophy & theory
4
550 - Earth sciences
4
001 - Knowledge
3
150 - Psychology
3
155 - Differential & developmental psychology
3
306 - Culture & institutions
3
more ...