Classification
620 - Engineering & allied operations
578
530 - Physics
279
600 - Technology
169
700 - The arts; fine & decorative arts
146
621 - Applied physics
124
900 - History & geography
95
333 - Economics of land & energy
90
541 - Physical chemistry
87
000 - Computer science, information & general works
81
540 - Chemistry & allied sciences
45
667 - Cleaning, color & coating technologies
39
670 - Manufacturing
37
610 - Medicine & health
33
380 - Commerce, communications & transportation
29
580 - Plants (Botany)
29
363 - Other social problems & services
28
543 - Analytical chemistry
27
414 - Phonology & phonetics
26
576 - Genetics & evolution
26
660 - Chemical engineering
24
062 - Organizations in British Isles; in England
23
330 - Economics
23
537 - Electricity & electronics
23
539 - Modern physics
22
547 - Organic chemistry
22
500 - Natural sciences & mathematics
21
006 - Special computer methods
17
140 - Specific philosophical schools
15
538 - Magnetism
13
340 - Law
12
548 - Crystallography
10
791 - Public performances
10
668 - Technology of other organic products
9
800 - Literature & rhetoric
9
531 - Classical mechanics; solid mechanics
8
536 - Heat
8
546 - Inorganic chemistry
8
370 - Education
7
571 - Physiology & related subjects
6
629 - Other branches of engineering
6
630 - Agriculture & related technologies
6
304 - Factors affecting social behavior
5
720 - Architecture
5
535 - Light & infrared & ultraviolet phenomena
4
551 - Geology, hydrology & meteorology
4
170 - Ethics
3
400 - Language
3
628 - Sanitary & municipal engineering
3
001 - Knowledge
2
005 - Computer programming, programs & data
2
more ...