Classification
581 - Specific topics in natural history
610 - Medicine & health
700 - The arts; fine & decorative arts
6
320 - Political science
5
000 - Computer science, information & general works
4
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
330 - Economics
3
363 - Other social problems & services
3
304 - Factors affecting social behavior
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
100 - Philosophy & psychology
1
300 - Social sciences
1
340 - Law
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
600 - Technology
1
658 - General management
1