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