Classification
370 - Education
600 - Technology
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
5
620 - Engineering & allied operations
4
140 - Specific philosophical schools
3
333 - Economics of land & energy
3
363 - Other social problems & services
3
100 - Philosophy & psychology
2
320 - Political science
2
330 - Economics
2
400 - Language
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
610 - Medicine & health
2
900 - History & geography
2
170 - Ethics
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
720 - Architecture
1