Classification
363 - Other social problems & services
4
551 - Geology, hydrology & meteorology
4
600 - Technology
3
620 - Engineering & allied operations
3
590 - Animals (Zoology)
2
700 - The arts; fine & decorative arts
2
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
900 - History & geography
1