Classification
100 - Philosophy & psychology
320 - Political science
380 - Commerce, communications & transportation
330 - Economics
12
170 - Ethics
7
300 - Social sciences
6
370 - Education
6
700 - The arts; fine & decorative arts
6
400 - Language
5
410 - Linguistics
5
600 - Technology
5
900 - History & geography
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
620 - Engineering & allied operations
4
363 - Other social problems & services
3
780 - Music
3
800 - Literature & rhetoric
3
340 - Law
2
551 - Geology, hydrology & meteorology
2
610 - Medicine & health
2
657 - Accounting
2
658 - General management
2
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
333 - Economics of land & energy
1
336 - Public finance
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1