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