Classification
540 - Chemistry & allied sciences
620 - Engineering & allied operations
10
600 - Technology
6
900 - History & geography
6
363 - Other social problems & services
4
140 - Specific philosophical schools
3
500 - Natural sciences & mathematics
3
590 - Animals (Zoology)
3
720 - Architecture
3
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
700 - The arts; fine & decorative arts
2
301 - Sociology & anthropology
1
330 - Economics
1
380 - Commerce, communications & transportation
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1