Classification
620 - Engineering & allied operations
600 - Technology
212
900 - History & geography
186
700 - The arts; fine & decorative arts
123
500 - Natural sciences & mathematics
108
333 - Economics of land & energy
104
330 - Economics
80
621 - Applied physics
72
000 - Computer science, information & general works
68
380 - Commerce, communications & transportation
48
363 - Other social problems & services
47
004 - Data processing & computer science
35
610 - Medicine & health
34
576 - Genetics & evolution
33
658 - General management
29
003 - Systems
27
140 - Specific philosophical schools
27
510 - Mathematics
27
340 - Law
26
384 - Communications; telecommunication
26
320 - Political science
23
720 - Architecture
22
745 - Decorative arts
19
370 - Education
18
530 - Physics
18
331 - Labor economics
16
580 - Plants (Botany)
16
551 - Geology, hydrology & meteorology
15
100 - Philosophy & psychology
14
300 - Social sciences
12
629 - Other branches of engineering
12
005 - Computer programming, programs & data
11
540 - Chemistry & allied sciences
10
800 - Literature & rhetoric
10
006 - Special computer methods
9
304 - Factors affecting social behavior
7
400 - Language
6
780 - Music
6
170 - Ethics
5
630 - Agriculture & related technologies
5
153 - Mental processes & intelligence
4
410 - Linguistics
4
519 - Probabilities & applied mathematics
4
624 - Civil engineering
4
781 - General principles & musical forms
4
120 - Epistemology, causation & humankind
3
301 - Sociology & anthropology
3
414 - Phonology & phonetics
3
660 - Chemical engineering
3
302 - Social interaction
2
more ...