Classification
500 - Natural sciences & mathematics
620 - Engineering & allied operations
200
600 - Technology
196
658 - General management
89
000 - Computer science, information & general works
78
700 - The arts; fine & decorative arts
76
520 - Astronomy & allied sciences
74
330 - Economics
72
333 - Economics of land & energy
63
005 - Computer programming, programs & data
61
331 - Labor economics
57
530 - Physics
56
300 - Social sciences
46
621 - Applied physics
46
384 - Communications; telecommunication
41
004 - Data processing & computer science
38
302 - Social interaction
38
576 - Genetics & evolution
37
670 - Manufacturing
37
900 - History & geography
35
610 - Medicine & health
34
745 - Decorative arts
31
510 - Mathematics
30
006 - Special computer methods
28
363 - Other social problems & services
27
580 - Plants (Botany)
26
380 - Commerce, communications & transportation
25
612 - Human physiology
21
338 - Production
18
540 - Chemistry & allied sciences
18
581 - Specific topics in natural history
17
340 - Law
16
629 - Other branches of engineering
14
140 - Specific philosophical schools
13
660 - Chemical engineering
13
100 - Philosophy & psychology
12
519 - Probabilities & applied mathematics
12
320 - Political science
10
551 - Geology, hydrology & meteorology
10
615 - Pharmacology & therapeutics
10
414 - Phonology & phonetics
9
531 - Classical mechanics; solid mechanics
9
381 - Commerce
8
153 - Mental processes & intelligence
7
332 - Financial economics
7
370 - Education
6
720 - Architecture
6
630 - Agriculture & related technologies
5
794 - Indoor games of skill
5
001 - Knowledge
4
more ...