Classification
140 - Specific philosophical schools
380 - Commerce, communications & transportation
600 - Technology
620 - Engineering & allied operations
900 - History & geography
5
363 - Other social problems & services
4
610 - Medicine & health
4
700 - The arts; fine & decorative arts
4
333 - Economics of land & energy
3
000 - Computer science, information & general works
2
330 - Economics
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
630 - Agriculture & related technologies
2
361 - Social problems & social welfare in general
1
576 - Genetics & evolution
1
658 - General management
1
800 - Literature & rhetoric
1