Classification
000 - Computer science, information & general works
320 - Political science
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
700 - The arts; fine & decorative arts
5
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
3
140 - Specific philosophical schools
2
720 - Architecture
2
900 - History & geography
2
300 - Social sciences
1
370 - Education
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
600 - Technology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1