Classification
363 - Other social problems & services
10
551 - Geology, hydrology & meteorology
600 - Technology
10
620 - Engineering & allied operations
333 - Economics of land & energy
6
330 - Economics
4
140 - Specific philosophical schools
3
320 - Political science
3
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
300 - Social sciences
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
581 - Specific topics in natural history
1
590 - Animals (Zoology)
1
610 - Medicine & health
1
700 - The arts; fine & decorative arts
1
720 - Architecture
1
900 - History & geography
1