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