Classification
620 - Engineering & allied operations
534
530 - Physics
297
621 - Applied physics
134
541 - Physical chemistry
107
667 - Cleaning, color & coating technologies
40
670 - Manufacturing
38
543 - Analytical chemistry
36
539 - Modern physics
31
062 - Organizations in British Isles; in England
29
006 - Special computer methods
26
537 - Electricity & electronics
26
660 - Chemical engineering
25
600 - Technology
19
700 - The arts; fine & decorative arts
17
538 - Magnetism
15
548 - Crystallography
15
333 - Economics of land & energy
13
500 - Natural sciences & mathematics
11
380 - Commerce, communications & transportation
10
531 - Classical mechanics; solid mechanics
10
536 - Heat
10
610 - Medicine & health
10
546 - Inorganic chemistry
9
540 - Chemistry & allied sciences
8
547 - Organic chemistry
8
900 - History & geography
8
000 - Computer science, information & general works
7
571 - Physiology & related subjects
6
629 - Other branches of engineering
6
518 - Numerical analysis
4
534 - Sound & related vibrations
4
668 - Technology of other organic products
4
001 - Knowledge
3
300 - Social sciences
3
535 - Light & infrared & ultraviolet phenomena
3
005 - Computer programming, programs & data
2
363 - Other social problems & services
2
515 - Analysis
2
549 - Mineralogy
2
572 - Biochemistry
2
576 - Genetics & evolution
2
665 - Industrial oils, fats, waxes & gases
2
003 - Systems
1
304 - Factors affecting social behavior
1
330 - Economics
1
338 - Production
1
414 - Phonology & phonetics
1
516 - Geometry
1
519 - Probabilities & applied mathematics
1
542 - Techniques, equipment & materials
1
more ...