Classification
620 - Engineering & allied operations
600 - Technology
129
370 - Education
119
500 - Natural sciences & mathematics
91
900 - History & geography
78
330 - Economics
75
333 - Economics of land & energy
65
700 - The arts; fine & decorative arts
65
658 - General management
55
363 - Other social problems & services
54
000 - Computer science, information & general works
52
005 - Computer programming, programs & data
42
610 - Medicine & health
39
621 - Applied physics
38
384 - Communications; telecommunication
34
380 - Commerce, communications & transportation
33
745 - Decorative arts
32
300 - Social sciences
29
331 - Labor economics
28
140 - Specific philosophical schools
24
100 - Philosophy & psychology
21
320 - Political science
20
630 - Agriculture & related technologies
18
720 - Architecture
17
400 - Language
16
006 - Special computer methods
15
338 - Production
15
576 - Genetics & evolution
13
302 - Social interaction
12
540 - Chemistry & allied sciences
12
629 - Other branches of engineering
11
530 - Physics
10
551 - Geology, hydrology & meteorology
10
580 - Plants (Botany)
10
670 - Manufacturing
10
004 - Data processing & computer science
9
340 - Law
8
770 - Photography, photographs & computer art
8
780 - Music
8
304 - Factors affecting social behavior
7
374 - Adult education
7
581 - Specific topics in natural history
7
510 - Mathematics
6
781 - General principles & musical forms
6
790 - Recreational & performing arts
6
153 - Mental processes & intelligence
5
301 - Sociology & anthropology
5
657 - Accounting
5
120 - Epistemology, causation & humankind
4
410 - Linguistics
4
more ...