Classification
320 - Political science
333 - Economics of land & energy
363 - Other social problems & services
600 - Technology
620 - Engineering & allied operations
330 - Economics
28
700 - The arts; fine & decorative arts
18
000 - Computer science, information & general works
15
551 - Geology, hydrology & meteorology
15
900 - History & geography
15
630 - Agriculture & related technologies
13
140 - Specific philosophical schools
7
370 - Education
6
581 - Specific topics in natural history
6
300 - Social sciences
5
580 - Plants (Botany)
5
610 - Medicine & health
5
380 - Commerce, communications & transportation
4
100 - Philosophy & psychology
3
540 - Chemistry & allied sciences
3
658 - General management
3
170 - Ethics
2
304 - Factors affecting social behavior
2
576 - Genetics & evolution
2
657 - Accounting
2
720 - Architecture
2
200 - Religion
1
350 - Public administration & military science
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
530 - Physics
1