Classification
320 - Political science
330 - Economics
600 - Technology
5
610 - Medicine & health
620 - Engineering & allied operations
5
900 - History & geography
333 - Economics of land & energy
4
000 - Computer science, information & general works
3
363 - Other social problems & services
3
700 - The arts; fine & decorative arts
3
370 - Education
2
551 - Geology, hydrology & meteorology
2
170 - Ethics
1
300 - Social sciences
1
360 - Social problems & services; associations
1
380 - Commerce, communications & transportation
1
530 - Physics
1
581 - Specific topics in natural history
1