Classification
320 - Political science
333 - Economics of land & energy
370 - Education
600 - Technology
700 - The arts; fine & decorative arts
330 - Economics
10
363 - Other social problems & services
9
000 - Computer science, information & general works
7
900 - History & geography
7
380 - Commerce, communications & transportation
6
620 - Engineering & allied operations
6
610 - Medicine & health
5
551 - Geology, hydrology & meteorology
4
720 - Architecture
4
300 - Social sciences
3
140 - Specific philosophical schools
2
530 - Physics
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
170 - Ethics
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
658 - General management
1