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