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