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