Classification
300 - Social sciences
330 - Economics
600 - Technology
320 - Political science
30
900 - History & geography
18
700 - The arts; fine & decorative arts
17
620 - Engineering & allied operations
16
100 - Philosophy & psychology
15
363 - Other social problems & services
14
370 - Education
14
333 - Economics of land & energy
13
380 - Commerce, communications & transportation
12
140 - Specific philosophical schools
11
000 - Computer science, information & general works
10
610 - Medicine & health
9
301 - Sociology & anthropology
8
340 - Law
7
400 - Language
7
658 - General management
7
500 - Natural sciences & mathematics
6
780 - Music
6
630 - Agriculture & related technologies
5
170 - Ethics
4
200 - Religion
4
302 - Social interaction
4
530 - Physics
4
576 - Genetics & evolution
4
304 - Factors affecting social behavior
3
410 - Linguistics
3
551 - Geology, hydrology & meteorology
3
581 - Specific topics in natural history
3
670 - Manufacturing
3
720 - Architecture
3
338 - Production
2
770 - Photography, photographs & computer art
2
006 - Special computer methods
1
332 - Financial economics
1
350 - Public administration & military science
1
540 - Chemistry & allied sciences
1
650 - Management & auxiliary services
1
657 - Accounting
1