Classification
380 - Commerce, communications & transportation
900 - History & geography
29
320 - Political science
7
700 - The arts; fine & decorative arts
6
600 - Technology
5
333 - Economics of land & energy
4
620 - Engineering & allied operations
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
200 - Religion
3
330 - Economics
3
400 - Language
3
410 - Linguistics
3
581 - Specific topics in natural history
3
301 - Sociology & anthropology
2
340 - Law
2
363 - Other social problems & services
2
576 - Genetics & evolution
2
610 - Medicine & health
2
658 - General management
2
791 - Public performances
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
300 - Social sciences
1
580 - Plants (Botany)
1
590 - Animals (Zoology)
1
720 - Architecture
1
780 - Music
1