Classification
000 - Computer science, information & general works
140 - Specific philosophical schools
330 - Economics
600 - Technology
5
610 - Medicine & health
658 - General management
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
380 - Commerce, communications & transportation
3
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
620 - Engineering & allied operations
2
630 - Agriculture & related technologies
2
361 - Social problems & social welfare in general
1
551 - Geology, hydrology & meteorology
1