Classification
330 - Economics
363 - Other social problems & services
590 - Animals (Zoology)
581 - Specific topics in natural history
2
000 - Computer science, information & general works
1
340 - Law
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
900 - History & geography
1