Classification
515 - Analysis
595
006 - Special computer methods
321
620 - Engineering & allied operations
267
003 - Systems
236
530 - Physics
226
629 - Other branches of engineering
176
621 - Applied physics
156
519 - Probabilities & applied mathematics
140
040 - [Unassigned]
73
005 - Computer programming, programs & data
61
512 - Algebra
44
535 - Light & infrared & ultraviolet phenomena
43
004 - Data processing & computer science
39
570 - Life sciences; biology
39
511 - General principles of mathematics
38
531 - Classical mechanics; solid mechanics
37
516 - Geometry
28
518 - Numerical analysis
28
658 - General management
23
510 - Mathematics
22
514 - Topology
17
690 - Buildings
12
330 - Economics
11
523 - Specific celestial bodies & phenomena
11
536 - Heat
11
333 - Economics of land & energy
10
571 - Physiology & related subjects
10
534 - Sound & related vibrations
9
520 - Astronomy & allied sciences
8
551 - Geology, hydrology & meteorology
8
612 - Human physiology
8
670 - Manufacturing
8
062 - Organizations in British Isles; in England
7
301 - Sociology & anthropology
7
500 - Natural sciences & mathematics
7
577 - Ecology
7
610 - Medicine & health
7
910 - Geography & travel
7
304 - Factors affecting social behavior
6
300 - Social sciences
5
539 - Modern physics
5
541 - Physical chemistry
5
624 - Civil engineering
5
030 - General encyclopedic works
4
338 - Production
4
501 - Philosophy & theory
4
550 - Earth sciences
4
660 - Chemical engineering
4
001 - Knowledge
3
150 - Psychology
3
more ...