Classification
100 - Philosophy & psychology
320 - Political science
380 - Commerce, communications & transportation
330 - Economics
9
170 - Ethics
8
000 - Computer science, information & general works
6
300 - Social sciences
6
370 - Education
6
700 - The arts; fine & decorative arts
6
140 - Specific philosophical schools
5
400 - Language
5
410 - Linguistics
5
600 - Technology
5
620 - Engineering & allied operations
4
900 - History & geography
4
363 - Other social problems & services
3
610 - Medicine & health
3
657 - Accounting
3
658 - General management
3
780 - Music
3
800 - Literature & rhetoric
3
333 - Economics of land & energy
2
551 - Geology, hydrology & meteorology
2
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
340 - Law
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
650 - Management & auxiliary services
1