Classification
330 - Economics
11
363 - Other social problems & services
11
800 - Literature & rhetoric
000 - Computer science, information & general works
6
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
551 - Geology, hydrology & meteorology
4
700 - The arts; fine & decorative arts
4
600 - Technology
3
320 - Political science
2
580 - Plants (Botany)
2
610 - Medicine & health
2
100 - Philosophy & psychology
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1