Classification
621 - Applied physics
790
620 - Engineering & allied operations
168
600 - Technology
135
700 - The arts; fine & decorative arts
111
000 - Computer science, information & general works
79
333 - Economics of land & energy
71
537 - Electricity & electronics
67
900 - History & geography
54
530 - Physics
52
610 - Medicine & health
43
535 - Light & infrared & ultraviolet phenomena
38
540 - Chemistry & allied sciences
38
363 - Other social problems & services
34
380 - Commerce, communications & transportation
33
580 - Plants (Botany)
27
330 - Economics
23
520 - Astronomy & allied sciences
20
539 - Modern physics
20
551 - Geology, hydrology & meteorology
17
384 - Communications; telecommunication
15
576 - Genetics & evolution
14
630 - Agriculture & related technologies
14
140 - Specific philosophical schools
13
500 - Natural sciences & mathematics
10
414 - Phonology & phonetics
9
004 - Data processing & computer science
8
320 - Political science
7
543 - Analytical chemistry
7
745 - Decorative arts
7
624 - Civil engineering
6
800 - Literature & rhetoric
6
910 - Geography & travel
6
340 - Law
5
538 - Magnetism
5
541 - Physical chemistry
5
550 - Earth sciences
5
629 - Other branches of engineering
5
658 - General management
5
664 - Food technology
5
515 - Analysis
4
612 - Human physiology
4
370 - Education
3
650 - Management & auxiliary services
3
003 - Systems
2
304 - Factors affecting social behavior
2
331 - Labor economics
2
519 - Probabilities & applied mathematics
2
571 - Physiology & related subjects
2
616 - Diseases
2
660 - Chemical engineering
2
more ...