Classification
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
42
333 - Economics of land & energy
16
330 - Economics
11
551 - Geology, hydrology & meteorology
10
581 - Specific topics in natural history
8
630 - Agriculture & related technologies
8
140 - Specific philosophical schools
6
320 - Political science
6
700 - The arts; fine & decorative arts
6
900 - History & geography
5
300 - Social sciences
4
540 - Chemistry & allied sciences
4
301 - Sociology & anthropology
3
580 - Plants (Botany)
3
590 - Animals (Zoology)
3
100 - Philosophy & psychology
2
610 - Medicine & health
2
000 - Computer science, information & general works
1
370 - Education
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
576 - Genetics & evolution
1
720 - Architecture
1