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