Classification
320 - Political science
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
15
333 - Economics of land & energy
13
330 - Economics
12
363 - Other social problems & services
11
000 - Computer science, information & general works
9
700 - The arts; fine & decorative arts
6
300 - Social sciences
5
551 - Geology, hydrology & meteorology
5
580 - Plants (Botany)
4
900 - History & geography
4
140 - Specific philosophical schools
3
304 - Factors affecting social behavior
3
370 - Education
3
610 - Medicine & health
3
100 - Philosophy & psychology
2
350 - Public administration & military science
2
540 - Chemistry & allied sciences
2
581 - Specific topics in natural history
2
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
576 - Genetics & evolution
1
657 - Accounting
1
720 - Architecture
1