Classification
590 - Animals (Zoology)
620 - Engineering & allied operations
6
900 - History & geography
6
140 - Specific philosophical schools
5
363 - Other social problems & services
5
500 - Natural sciences & mathematics
5
540 - Chemistry & allied sciences
3
580 - Plants (Botany)
3
581 - Specific topics in natural history
3
600 - Technology
3
720 - Architecture
3
551 - Geology, hydrology & meteorology
2
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1